LU-11057 tests: exercise 'network' client mount option

LU-11057 tests: exercise 'network' client mount option

Test 'network' client mount option that enables to limit connections
from the client to be on the network NID specified.

This option is currently not compatible with Dynamic Peer Discovery.
test_31 will have to be updated once Dynamic Peer Discovery is
modified so that it does not conflict with 'network' client mount
option.

Test-Parameters: trivial testlist=sanity-sec
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: I4631a034137a346d0bb4efed20983e2a8bd7b0ec
Reviewed-on: https://review.whamcloud.com/32590
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Amir Shehata <ashehata@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>