This patch set removes Pegleg stub logic from the CLI and engine
because:
1) It's currently broken following revisioned repository support
with https://review.openstack.org/#/c/577886/
2) The functionality isn't used anywhere in Airship, either upstream
or downstream
3) The functionality is, in any case, obsolete following the
revision repository change
As such, it is better if we simply remove the stub logic out for
now and revisit the implementation later, once the requirements
for it are fully fleshed out to align with modern Pegleg architecture.
Change-Id: If82b91bcdd39555596f2a4003bfda0167142fddd
372b0a541e