LU-11504 tests: trigger lfsck after/during failover/failback

LU-11504 tests: trigger lfsck after/during failover/failback

Patch adds the possibility to trigger lfsck
during and/or after failover/failback tests on
specified node with spectified device if set and
with lfsck custom parameters if required.

Test-Parameters: trivial
Signed-off-by: Elena Gryaznova <c17455@cray.com>
Cray-bug-id: LUS-6123,LUS-6591
Reviewed-by: Alexander Boyko <c17825@cray.com>
Reviewed-by: Vladimir Saveliev <c17830@cray.com>
Reviewed-by: Andrew Perepechko <c17827@cray.com>
Change-Id: I4bdafdb5e6840f13e23a41abcda55de78db9d8b4
Reviewed-on: https://review.whamcloud.com/33351
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alexandr Boyko <c17825@cray.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>