Stop importing CommandFailedError from teuthology.orchestra.run, it is
actually defined in teuthology.exception.
Fixes: https://tracker.ceph.com/issues/51226
Signed-off-by: Rishabh Dave <ridave@redhat.com>
There were a couple of problems found by flake8 in the qa/
directory (most of them fixed now). Enabling flake8 during the usual
check runs hopefully avoids adding new issues in the future.
Signed-off-by: Thomas Bechtold <tbechtold@suse.com>