BtExt: BT turn on failing during user switch

1) Turn on Bluetooth
2) Switch User to Guest
3) Do above steps multiple times

Error:
On ui bluetooth share has stopped is shown.

Root Cause:
FTP and Dun services trying to start from older user
account which is not in foreground.

Fix:
Catch security exception while creating server socket
and break out the loop of socket-retry, to prevent
server socket creation from invalid user.

CRs-Fixed: 2214304
Change-Id: I97bead89b89b9f066912b226b7b18f080a10a2cd