Fixes #6620: Allow plugins to define a file to be included in test_helper.
For some plugins additions to the test_helper are needed to allow the test suite to pass. This checks if a file test/support/foreman_support exists and requires it after all the Foreman test setup is done.
Related issues
Bug #6620: Allow plugins to include test setup code in the test_helper
Fixes #6620: Allow plugins to define a file to be included in test_helper.
For some plugins additions to the test_helper are needed to allow
the test suite to pass. This checks if a file test/support/foreman_support
exists and requires it after all the Foreman test setup is done.