LU-13055 libcfs: allow comma-separated masks

LU-13055 libcfs: allow comma-separated masks

For debug and changelog mask names, allow a comma-separated list
of names to be given, so that the space-separated list does not
need to be quoted for use.

Change sanity-quota to use a comma-separated list to verify it works.

Fix a couple of test cases where the debug parameter is set and
printed overly verbosely during tests.

Lustre-change: https://review.whamcloud.com/43741
Lustre-commit: 6b6fde1026311a28595ea43af56392ca6ad24d79

Test-Parameters: trivial testlist=sanity-quota
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Icf1e3ebc74f0e48b38a65486b2275ec4c33ebbe5
Reviewed-by: Emoly Liu <emoly@whamcloud.com>
Reviewed-by: Mike Pershin <mpershin@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/46759
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>