Added required ipwrapper functions for iproute2 configurator

These ipwrapper functions are required by more than one patch
so for efficiency's sake I've moved them to a separate patch.

Change-Id: I9283ae90f84fa930e401b3ecd2e18935ba9ca2f5
Signed-off-by: Assaf Muller <amuller@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/18585
Reviewed-by: Antoni Segura Puimedon <asegurap@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Tested-by: Dan Kenigsberg <danken@redhat.com>