Testing Done: built new ifupdown package and ran testifupdown2 suite of tests
This patch prevents enslaved interfaces from having IP addresses.
(cherry picked from commit 0c00606fbc76db11557a8e946310e93a2b376aa7)
Testing Done: Tested with shared slaves in bridge and bonds
(cherry picked from commit 6f990450001d367a775681a29cdce74f862f7848)
(cherry picked from commit 8d9a5107112628ee8434e227dff49a0ef09966ee)