Made FailureREEF test use the TestEnvironment

This is a minor fix to make sure all tests in `reef-tests` use the test environment mechanism to setup the local or YARN runtime
Merge pull request #960 from Microsoft-CISL/weimer_unit_test_update

Made FailureREEF test use the TestEnvironment
[maven-release-plugin] prepare release reef-project-0.7
[maven-release-plugin] prepare for next development iteration
Merge branch 'master' of https://github.com/Microsoft-CISL/REEF into yingdac-evaluators-checking-back-in