LU-1095 debug: Standardize, suppress mount/umount messages

LU-1095 debug: Standardize, suppress mount/umount messages

Standardize mount/umount console message to include profile name,
and optionally suppress them with the 'quiet' mount option.  We
have been using private namespaces for testing and mounting then
umounting the FS as needed for each job.  In this context these
messages end up causing alot of syslog noise.

Signed-off-by: Christopher J. Morrone <morrone2@llnl.gov>
Change-Id: I7514f6016c337a358e5e31146644810dff292d02
Reviewed-on: http://review.whamcloud.com/2199
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Yu Jian <yujian@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>