Make netinfo's _match_name a vdsm lib utility.

move the functionality to lib/vdsm/utils.py and drop the non
pythonic map in favor of a generator.

Change-Id: I6075332ae5f2532c7b70fd4baa0ca25c7cef1d3e
Signed-off-by: Antoni S. Puimedon <asegurap@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/21152
Reviewed-by: Dan Kenigsberg <danken@redhat.com>