Delete bogus dist checks from RedHatOpenStack

We already know we are running on RHEL or Fedora if we are
executing a plug-in class tagged with RedHatPlugin. Do not check
for /etc/*-release.

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>
Fix add_copy_specs(string) bugs in openstack.py

OpenStack was full of the add_copy_specs(string) anti-pattern.
While we should address this properly these instances all need
fixing to avoid collecting the whole file system.

They should also have been tested before being put forward as
a pull request.

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>