There are so many protection tests now, and for the moment they are so
inefficient, that running them all as part of our main unit test suite
for py27, py36, py37, and cover jobs yields a high rate of timeouts
which reduces our own development velocity and negatively impacts every
project that co-gates with keystone. This change splits the protection
tests into their own level of tests outside of the configured stestr
test_path and adds a separate tox environment and zuul job to run just
the protection tests on their own. Parallelizing these tests should help
alleviate the timeout issue while we work on making these tests more
efficient.
Change-Id: Ibb12053bd6864a153f7e3998dbd008b6eec4295b
5e35efd55f