LU-8596 tests: lnet-selftest test failed.

LU-8596 tests: lnet-selftest test failed.

lnet-selftest saturates the network while it is running.
This patch updates lnet-selftest to unmount client so
that it may not hamper the testing. The clients mount
are restored after the test completes.

Test-Parameters: trivial testlist=lnet-selftest
Signed-off-by: Arshad Hussain <arshad.hussain@seagate.com>
Signed-off-by: Abrarahmed Momin <abrar.habib@seagate.com>
Seagate-bug-id: MRP-2764
Change-Id: I76cda974cada9078e2671e1b505ed1c52f46e9ae
Reviewed-by: Ashish Purkar <ashish.purkar@seagate.com>
Reviewed-by: Elena V. Gryaznova <elena.gryaznova@seagate.com>
Tested-by: Elena V. Gryaznova <elena.gryaznova@seagate.com>
Reviewed-on: https://review.whamcloud.com/22429
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Doug Oucharek <doug.s.oucharek@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>