LU-12410 lnet: Add additional output to sanity-lnet.sh

LU-12410 lnet: Add additional output to sanity-lnet.sh

Add wrappers around ip netns exec and lnetctl commands to generate
some additional test output. This makes it easier to see what each
test case is doing from the test script output, and aids in debugging
any problems.

Lustre-change: https://review.whamcloud.com/36242
Lustre-commit: 32528a689889989607a34b21efa583429bda1422

Test-parameters: trivial testlist=sanity-lnet

Signed-off-by: Chris Horn <hornc@cray.com>
Change-Id: I95b18cb3a090527548a8f9e65845eb4a18dea6d6
Reviewed-by: Shaun Tancheff <stancheff@cray.com>
Reviewed-by: Petros Koutoupis <pkoutoupis@cray.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/44188
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>