Fix for default USB debugging in eng builds.

* Start adbd on first launch and accept all connections for eng
* Start adbd on first launch and prompt for userdebug
* Do not start adbd for user.

Change-Id: I26d1ef1bb208cec79d45687aea833a1b3e076b83
Merge remote-tracking branch 'cm/cm-11.0' into cm-11.0