Stop using shared DUN APN when tethering stops.

Even if other people are sharing the connection (ie, carrier wants
default and tethered traffic on the same APN) stop using
a carrier-described APN when the tethering stops.

bug:5525764
Change-Id: I95ed2aaed4d79519d233a62cf2945edead8114bc
1 file changed
tree: 01bd558e3aded1b7477b1e24a8eb136d3951c501
  1. core/
  2. services/