Create run-cover role

We incorrectly used the run-tox role for our coverage jobs.  Correct
this by creating the run-cover role and updating tox-cover job to use
it.

Change-Id: I775fa00577856c3914266d23d32e9333b70e7db7
Signed-off-by: Paul Belanger <pabelanger@redhat.com>
3 files changed