LU-8473 tests: skip conf-sanity test 41a with separate MGT and MDT

LU-8473 tests: skip conf-sanity test 41a with separate MGT and MDT

conf-sanity test 41a is to test “nosvc” and “nomgs” mount options
on a combined MGT/MDT device. It’s not applicable for separate
MGT and MDT configuration. This patch adds codes to check that.

Test-Parameters: trivial combinedmdsmgs=false envdefinitions=ONLY=41a testlist=conf-sanity

Test-Parameters: trivial envdefinitions=ONLY=41a testlist=conf-sanity

Signed-off-by: Jian Yu <jian.yu@intel.com>
Change-Id: I967f63c70953c7c8e5bb296e832ee5335e56f69c
Reviewed-on: http://review.whamcloud.com/21651
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>