Detect if iproute2 support SR-IOV commands

Add sanity_check that 'ip link' command supports VF management and
link state changes of VF by parsing 'ip link help' command output.

Co-authored-by: Samer Deeb <samerd@mellanox.com>
Closes bug: 1349302

Change-Id: I5a72a9061a76c39960076f078905371f07069431
Merge "Detect if iproute2 support SR-IOV commands"