netinfo: drop unused intToAddress

Back when we introduced ipwrapper's Route class (commit
9903861228c4b16fa5636f626e7548f8f0d0f41f), we dropped the only
usage of netinfo's intToAddress. Since it had a very specific
usage, it is safe to drop it.

Change-Id: I29bc8467cd25c298221d68d10379a123b2d735e7
Signed-off-by: Antoni S. Puimedon <asegurap@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/29604
Reviewed-by: Dan Kenigsberg <danken@redhat.com>