LU-7734 lnet: Enhance DLC ip2nets

LU-7734 lnet: Enhance DLC ip2nets

If the interfaces YAML block is specified then commission
the interfaces which match the ip-range if it is defined.
Otherwise commission the interfaces as long as they exist
and are up.

If the interfaces YAML block is not specified but an
ip-range is specified then configure all interfaces
in the system that match the ip-range.

If no interfaces and no ip-range is specified, then
commission the first interface that exists and is UP.

Signed-off-by: Amir Shehata <amir.shehata@intel.com>
Change-Id: I01b2ced6f50fed2528f626166154be874f394e8b
Reviewed-on: http://review.whamcloud.com/22372
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Olaf Weber <olaf@sgi.com>