Update Oslo config sample generator

This commit syncs the latest version of the config generator and all
it's dependency modules from oslo-incubator. The justification was
change Iee6cc05cad70963f2a151f595ac376c9338f5774 which adds the oslo
synced version of the check_uptodate script. Which among other things
does proper cleanup of the tempdirs

Change-Id: I56bdd239b328cc38a83f80d14e53cc62d4f97954
Add config fixture support to unit tests

This commit adds a new env variable OS_TEST_LOCK_PATH to the
.testr.conf file to set the lock path for using oslo locks.
Previously, if an external lock couldn't be used to isolate test cases
because the unit tests do not have a config file. By getting a lock
path with an env variable and setting the location in the config
fixture external locks can be used by first invoking the config
fixture.

Partially implements bp unit-tests

Change-Id: I08c27ab125183f5d055eaa45c4f0e0a527445475
Merge "Update Oslo config sample generator"
Merge "Add config fixture support to unit tests"