* Fixed: install in system the 'coverage' version set in
requirements.txt as dashboard/module.py uses system version.
* Updated 'coverage' to latest stable version.
* Added teuthology missing dependency:
backports.ssl-match-hostname
* More precise coverage measurement through CherryPy Bus API.
* Coverage report shown when no ceph-mgr running
(cleanup_teuthology).
Fixes: https://tracker.ceph.com/issues/36176 Signed-off-by: Alfonso MartÃnez <almartin@redhat.com>