DO NOT MERGE Always set/remove default routes.

Must clean up default route if a default 3g connection is replaced
by a non-default (ie, mms) connection on teh same interface.

Also stop mucking with all connections dns and routes - do it only
for the connection that has changed.

bug:2865974
Change-Id: Ifdf49080fa0413a4d826813706c809975a562dfa
1 file changed
tree: 3a606886e87e9a232ca59338b7b5413c5b5f763c
  1. core/
  2. services/