android-daemon: Remove preference "storage_mode" from reload configuration set

This change is already honored by a complete daemon restart.
android-daemon: Fix P2pManager pause() condition
android-daemon: Store p2p interfaces in P2pManager

The set of interfaces is used to bring interfaces down/up on manager
pause/resume states.
daemon: Rename local variable according to coding style
daemon: Several locks moved and replaced in ConnectionManager to avoid dead-lock
Latest fixes and improvents merged from master.
android-daemon: Only reactivate active p2p interfaces