Improves lunar-devel jenkins test stability

[kmactavish]

This PR is to establish a Jenkins test-result baseline for lunar-devel. #1133 is failing stochastically, and this PR is being used to establish a baseline of which stochastic failures are expected on devel (if any).
Update: Also fixes one flaky test:

• extend random_play.py timeout

[kmactavish]

Triggered jobs 324-331. Update: only one failed, new commit to extend that timeout.

[kmactavish]

Triggered jobs 332-339. Update: 338 failed, but I can't find any "RESULT: FAIL" in the output...

[mikaelarguedas]

@kmactavish If it's of any help: It looks like the failing test is a nosetest added( using catkin_add_nosetests) and not a rostest.
Nosetests output results as "OK" or FAILED (failures=1) or FAILED (errors=1). The "SUMMARY" is part of rostest I believe, and thus not printed by "pure" nose of gtest tests.

[kmactavish]

Build 345 failed (not this branch). It was in raceConditionCallback, which is flawed.
Explanation (main is the main thread, add is the spawned thread):

• main gets to line 471 (queue is cleared)
• add sees sync is true, does its thing (setting sync to false, adding the callback to the queue)
• main sets sync back to true! and calls the callback (setting one to false)
• add sees sync is true, does its thing (setting one to true)
• main wakes up, and having called the callback, checks to make sure one is false. It's not!
  So, ironically, there was a secondary, unintentional race condition in the race condition check 😱.

Fixed by only setting the sync flag in one thread. It means adding another check to see if the queue is empty in the second thread.

[kmactavish]

@mikaelarguedas Thanks! That helped.

[kmactavish]

Build 355 (not this branch) also failed due to the compression ratio test thresholds, but in the other direction, relaxed them more.

[kmactavish]

@esteve, I had to change your raceConditionCallback test (see above). You might want to have a look and make sure it still tests for the right things after my modifications.

[dirk-thomas]

Thank you for improving the stability of the tests.