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.

Test-parameters: trivial
Test-parameters: testlist=sanity-lnet
Signed-off-by: Chris Horn <hornc@cray.com>
Change-Id: I95b18cb3a090527548a8f9e65845eb4a18dea6d6
Reviewed-on: https://review.whamcloud.com/36242
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Shaun Tancheff <stancheff@cray.com>
Reviewed-by: Petros Koutoupis <pkoutoupis@cray.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>