LU-10717 tests: tests should not start mgs

LU-10717 tests: tests should not start mgs

The conf-sanity prolog do reformat_and_config which leaves
mgs service started, if it is not combined.
So, in general, test should not start mgs service, if it don't
stop mgs. And test should start mgs after reformat.

The client mount requires start of all MDTs, because of
MDT0000-osp-MDT000X synchronization.

Lustre-change: https://review.whamcloud.com/33589
Lustre-commit: aa9f9344fc741523ee8693569effb5b77204f90b

Test-Parameters: trivial testlist=conf-sanity
Test-Parameters: mdscount=2 mdtcount=4 testlist=conf-sanity
Test-Parameters: standalonemgs=true testlist=conf-sanity
Test-Parameters: standalonemgs=true mdscount=2 mdtcount=4 testlist=conf-sanity
Cray-bug-id: LUS-2524
Signed-off-by: Alexander Boyko <c17825@cray.com>
Change-Id: I226eab5683afc36efe908b200f46b710f6235374
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Elena Gryaznova <c17455@cray.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/35368
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>