Instead of passing lockutils loading explicitly in the test run
command line, provide the support for individual test classes to ask
that lock_path is setup with the REQUIRES_LOCKING = True class
parameter.
Augment all classes that currently fail without this with
REQUIRES_LOCKING = True. Hopefully many of those can be individually
removed in the future so we can get out of needing external locking in
any of our unit tests.
Change-Id: I56229e93ad61ac823646a4119a035d36c3400173
a2d8734881