For local dev, multiple iterations can wind up with multiple
files in the build_artifact dir. Remove them when building so
that the ls command works.
Change-Id: Id309c34679d2c0b6d9380665a381af4b52495d19
OpenStack in general uses git tags to drive versioning of artifacts.
This is important because of our code review driven workflow, since
patches don't necessarily land in a predictable sequence, so flows
requiring a version number in a file to be updated at a specific
time are problematic.
By having pbr generate the correct version number then putting that
into the galaxy.yml file, we can match the behavior without too much
undue burden.
Also ignore build_artifact directory.
Change-Id: Id02fee682fb5a4b6fd6dcb0644848e6d1269e19b
