pbr looks at the git tag for the version, so we do not
want a hard-coded value in the setup.cfg
pbr handles dev tagging automatically, so don't do
that via setup.cfg
pbr recursively finds packages, so we do not need to
list them explicitly in setup.cfg
Change-Id: I59a3e9d789c97f2cb9b6c487c553127af5a36b9f