BT: Fix following issues in data profiles

 - Add handling to remove sdp record from OPP profile
   when BT is turning off, so that the enteries can be
   removed from stack's security database.

 - CleanUp for unnecssary server socket references from OppService.

 - Add null checks in OPP code.

Change-Id: I2a596dcc9a0f0731e80175a26bcf294a5e9e6f0e
CRs-Fixed: 968880