DcTrackerBase: Dont provision APN if default is disconnecting

Change-Id: I4f1d6551dee3dc2f737fda0fefde95d441ef25e1
Merge "DcTrackerBase: Dont provision APN if default is disconnecting" into android-4.4
Merge remote-tracking branch 'omni/android-4.4' into omni-4.4