environmentVariables are not passed to flank.yml

We have environmentVairables in fladle block.

```
environmentVariables = [
      "clearPackageData": "true",
      "listener"        : "a.b.c.Foo1" +
               "a.b.c.Foo2"
  ] 
```
environmentVairables are not present in flank.yml and they are not passed to test run on firebase.