Fixes #839: Adding disabled tests to catkin_test_results summary.

[rsinnet]

I set it to read from both disabled (gtest) and skipattributes. I myself haven't seen skip but it appeared in the ament commit: ament/ament_tools@0c6003b.

[rsinnet]

Closing and reopening, deleted two debug print statements that I added and want to rerun tests.

[dirk-thomas]

@rsinnet Thank you for the contribution. I have created a new PR #848 against the kinetic-devel branch (while maintaining your authorship of the commit). Since all these Python function are potentially being used by other code changing their return values to include the skipped tests would break existing code. Therefore I have created new functions (with the suffix 2) which provide the skipped tests while maintaining the existing API. It would be great if you could test the referenced PR and confirm if it works for you.

[rsinnet]

Closing this since it has been merged via PR #848.