Hashes of nodes change with a variant of the root node for exactly the same DAG

If one diffs the concretized specs of `spack spec dealii@develop` and `spack spec dealii@develop~python+mpi ^boost+python` there is a zero difference apart from the `python` variant of the root node (`dealii`) -- this is expected and a desired behaviour. In other words dags should be identical and so their hashes.

However after successfully installing 

```
$ spack install dealii@develop
==> dealii is already installed in /Users/davydden/spack/opt/spack/darwin-elcapitan-x86_64/clang-7.3.0-apple/dealii-develop-if6ztag7fopoe7vcppk2sidqe44j7u7b
```

 the second build actually starts with re-installing `hwloc` and then, supposedly, `openmpi` and the rest:

```
$ spack install dealii@develop~python+mpi ^boost+python
==> Installing dealii
==> metis is already installed in /Users/davydden/spack/opt/spack/darwin-elcapitan-x86_64/clang-7.3.0-apple/metis-5.1.0-sawhq7id7lig7enw7qhexuj423xk6eq7
==> Installing trilinos
==> Installing superlu-dist
==> Installing openmpi
==> Installing hwloc
==> libpciaccess is already installed in /Users/davydden/spack/opt/spack/darwin-elcapitan-x86_64/clang-7.3.0-apple/libpciaccess-0.13.4-plgdrjeje7tk63kv65wuhptmi5rhbugr
==> Can not find version 1.11.3 in url_list
==> Already downloaded /Users/davydden/spack/var/spack/stage/hwloc-1.11.3-jtkwa4li2oxkedg6j4fc2p2in2tlf3hb/hwloc-1.11.3.tar.gz
==> Already staged hwloc-1.11.3-jtkwa4li2oxkedg6j4fc2p2in2tlf3hb in /Users/davydden/spack/var/spack/stage/hwloc-1.11.3-jtkwa4li2oxkedg6j4fc2p2in2tlf3hb
==> No patches needed for hwloc
==> Building hwloc
```

Something is certainly wrong here. 

Could it be that hashes are dependent on **normalized** specs, which are different here:

```
Input spec
------------------------------
  dealii@develop+mpi~python
      ^boost+python

Normalized
------------------------------
  dealii@develop+mpi~python
      ^astyle@2.04
      ^blas
      ^boost@1.59.0:+iostreams+mpi+python+serialization+system+thread
          ^bzip2
          ^mpi
          ^python
              ^ncurses
              ^openssl
                  ^zlib
              ^readline
              ^sqlite
      ^cmake
      ^lapack
      ^muparser
      ^numdiff
          ^gettext
      ^suite-sparse
      ^tbb
```

vs

```
Input spec
------------------------------
  dealii@develop

Normalized
------------------------------
  dealii@develop
      ^astyle@2.04
      ^blas
      ^bzip2
      ^cmake
      ^lapack
      ^muparser
      ^numdiff
          ^gettext
      ^suite-sparse
      ^tbb
      ^zlib
```

Below is the Conretized specs (again, the only difference between the two is `~python` vs `+python` of the root node):

```
Concretized
------------------------------
  dealii@develop%clang@7.3.0-apple+arpack~doc+gsl+hdf5+metis+mpi+netcdf+oce+p4est+petsc~python+slepc+trilinos arch=darwin-elcapitan-x86_64
      ^arpack-ng@3.4.0%clang@7.3.0-apple+mpi+shared arch=darwin-elcapitan-x86_64
          ^cmake@3.6.0%clang@7.3.0-apple~doc+ncurses+openssl~qt arch=darwin-elcapitan-x86_64
              ^ncurses@6.0%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
              ^openssl@1.0.2h%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
                  ^zlib@1.2.8%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
          ^openblas@0.2.18%clang@7.3.0-apple+fpic~openmp+shared arch=darwin-elcapitan-x86_64
          ^openmpi@2.0.0%clang@7.3.0-apple~mxm~pmi~psm~psm2~slurm~sqlite3~thread_multiple~tm~verbs+vt arch=darwin-elcapitan-x86_64
              ^hwloc@1.11.3%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
                  ^libpciaccess@0.13.4%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
                      ^libtool@2.4.6%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
                          ^m4@1.4.17%clang@7.3.0-apple+sigsegv arch=darwin-elcapitan-x86_64
                              ^libsigsegv@2.10%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
      ^astyle@2.04%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
      ^boost@1.61.0%clang@7.3.0-apple+atomic+chrono+date_time~debug+filesystem~graph~icu_support+iostreams+locale+log+math+mpi+multithreaded+program_options+python+random+regex+serialization+shared+signals+singlethreaded+system+test+thread+timer+wave arch=darwin-elcapitan-x86_64
          ^bzip2@1.0.6%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
          ^python@2.7.12%clang@7.3.0-apple~tk~ucs4 arch=darwin-elcapitan-x86_64
              ^readline@6.3%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
              ^sqlite@3.8.5%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
      ^gsl@2.1%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
      ^hdf5@1.10.0-patch1%clang@7.3.0-apple+cxx~debug+fortran+mpi+shared~szip~threadsafe arch=darwin-elcapitan-x86_64
      ^metis@5.1.0%clang@7.3.0-apple~debug~gdb~idx64~real64+shared arch=darwin-elcapitan-x86_64
      ^muparser@2.2.5%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
      ^netcdf@4.4.1%clang@7.3.0-apple~hdf4+mpi arch=darwin-elcapitan-x86_64
          ^curl@7.49.1%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
      ^netcdf-cxx@4.2%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
      ^numdiff@5.8.1%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
          ^gettext@0.19.8.1%clang@7.3.0-apple+bzip2+curses+git~libunistring+libxml2+tar+xz arch=darwin-elcapitan-x86_64
              ^libxml2@2.9.2%clang@7.3.0-apple~python arch=darwin-elcapitan-x86_64
                  ^xz@5.2.2%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
              ^tar@1.28%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
      ^oce@0.17.2%clang@7.3.0-apple+tbb arch=darwin-elcapitan-x86_64
          ^tbb@4.4.4%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
      ^p4est@1.1%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
          ^autoconf@2.69%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
          ^automake@1.15%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
          ^lua@5.3.2%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
      ^petsc@3.7.2%clang@7.3.0-apple+boost~complex~debug+double+hdf5+hypre+metis+mpi+mumps+shared+superlu-dist arch=darwin-elcapitan-x86_64
          ^hypre@2.10.1%clang@7.3.0-apple~internal-superlu~shared arch=darwin-elcapitan-x86_64
          ^mumps@5.0.1%clang@7.3.0-apple+complex+double+float~idx64~metis+mpi~parmetis~ptscotch~scotch+shared arch=darwin-elcapitan-x86_64
              ^netlib-scalapack@2.0.2%clang@7.3.0-apple~fpic+shared arch=darwin-elcapitan-x86_64
          ^parmetis@4.0.3%clang@7.3.0-apple~debug~gdb+shared arch=darwin-elcapitan-x86_64
          ^superlu-dist@5.0.0%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
      ^slepc@3.7.1%clang@7.3.0-apple+arpack arch=darwin-elcapitan-x86_64
      ^suite-sparse@4.5.3%clang@7.3.0-apple+tbb arch=darwin-elcapitan-x86_64
      ^trilinos@12.6.4%clang@7.3.0-apple+boost~debug+hdf5+hypre+metis+mumps~python+shared+suite-sparse+superlu-dist arch=darwin-elcapitan-x86_64
          ^glm@0.9.7.1%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
          ^matio@1.5.2%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
          ^swig@3.0.10%clang@7.3.0-apple arch=darwin-elcapitan-x86_64
              ^pcre@8.38%clang@7.3.0-apple+utf arch=darwin-elcapitan-x86_64
```


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Hashes of nodes change with a variant of the root node for exactly the same DAG #1457

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Hashes of nodes change with a variant of the root node for exactly the same DAG #1457

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