Write Integration Tests for Resource Manager

[ajkannan]

Until issue #431 is solved, we'll have to use a JSON file already generated by the Google Cloud SDK, placed in the proper directory. Once this issue is resolved, we should fix the CI to user a JSON file from any location.

[ajkannan]

Because the GOOGLE_APPLICATION_CREDENTIALS are set during Travis CI runs with integration tests, the strategy mentioned above won't work. As a result, this issue is blocked on #431.

[ajkannan]

Once we solve the credentials problem, we should also test IAM functions (getting/setting policies)

[yihanzhen]

The feature request is added to the backlog. The issue will be closed but is linked in the backlog and can continue to be used for comment and discussion.