Bluetooth: Avoid window leak when screen orientation changes

Enable screen orientation change support in Bluetooth Settings app
during any Bluetooth Setting Activity. Otherwise, window leak may
observe while screen orientation changes.

CRs-Fixed: 556653
Change-Id: I8868f4c6e96277fd17484f810de6a700198a5287
p2p: Fix for GC unable to scan GO after tear down.

A start of the search is not done on a group removed
broadcast event for mLastGroupFormed being set, which
would result in the Group Client not able to find the
GO , though a p2p_find is issued before a disconnect.
This is due to the fact that supplicant shall notify
the p2p device info only once per p2p_find.

To avoid this remove the conditions that is blocking
the search to happen and issue another p2p_find.

Change-Id: I4abad5c472808f9aa03e644eb1c6a26bfab8a4e6
CRs-Fixed: 504022
Bluetooth: disable scan icon when BT state is off

Usually onScanningStateChanged function should take care
of disabling the scan icon when the scan is completed.

But When the BT scan is going on and try to switch of the
BT, as onScanningStateChanged function doesn't have the
reference for scan icon it will not disable it, so disabling
is taken care in BluetoothSettings on receiving BT Off state.

CRs-Fixed: 543777
Change-Id: Ib827903d4f5c80eeb6ac8a06fb1a945140dd20c9
Bluetooth: Add onStop activity for Bluetooth Setting app

Added onStop activity in Bluetooth Setting app to avoid unhandled
onPause activity from calling stop discovery. Otherwise, inquiry
will stop immediately and inquiry results will be empty.

CRs-Fixed: 561127
Change-Id: I58282060576d827d79f6d713426b8a2fb49f4bf5