LU-9860 tests: Run command on MGS for conf-sanity 33a

LU-9860 tests: Run command on MGS for conf-sanity 33a

When conf-sanity test 33a is run on a Lustre configuration
with separate MGS and MDS, the 'lctl set_param' command for
timeout must be run on the MGS.

For the same test, adding the '--mgs' flag when formatting
the MDS of the second file system should be based on
if there is a combined or separate MDS and MGS.

Test-Parameters: combinedmdsmgs=false testlist=conf-sanity

Signed-off-by: James Nunez <james.a.nunez@intel.com>
Change-Id: Iadb9e0e3ab4f64edba2c0bbc938e64ff3bce9468
Reviewed-on: https://review.whamcloud.com/28478
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Wei Liu <wei3.liu@intel.com>
Reviewed-by: Saurabh Tandan <saurabh.tandan@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>