DO NOT MERGE Add ability to include/exclude tests from buildCts.py.

Move CTS-stable and CTS-flaky plan config into buildCts.py and
take advantage of the new include attribute on Entry to
simplify the flaky plan.

bug:15139133

Change-Id: I0dac54e3f813d52167cd6b7670b0982aeb5cce1e

Conflicts:
	tests/plans/CTS-flaky.xml
	tests/plans/CTS-stable.xml
4 files changed