Port tests from iris/tests/integration/test_grib_save.py #198
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Companion PR: SciTools/iris#3669
Basically a lift and shift of the tests in iris/tests/integration/test_grib_save.py other than the minor necessary changes such as inherit from
iris_grib.tests.IrisGribTestrather thaniris.tests.IrisTestI just moved it to a file called iris_grib/tests/integration/save_rules/test_grib_save.py as I thought that would be the easiest to review, but I could move it somewhere more sensible, iris_grib/tests/integration/save_rules/init.py for example.