Message 190384 - Python tracker

Biggest change is no support module in 2.7, so in test_idle.py import inside try:except to skip if dependencies not present. Minor changes in CallTips.py and test_calltips.py. Buildbots are fine. This meets my initial goal; issue done.

I opened #18103 for consideration of gui tests. But except for improving the existing no-buildbot, human-needed tests, I consider that a lower priority right now.