Cancel BLE connection attempt currently in progress

Cancel BLE connection attempt currently in progress

[Model] All
[BinType] AP
[Customer] OPEN

[Issue#] N/A
[Request] Internal
[Occurrence Version] N/A

[Problem] Unable to abort BLE connection attempt
[Cause & Measure] Abort connection attempt and send "Cancelled" event to upper side
[Checking Method] Cancel BLE connection attempt

[Team] IoT Hub
[Developer] Injun Yang
[Solution company] Samsung
[Change Type] Specification change

Change-Id: I8eb1edfa33a12a39ba6abc5f3838fc73e987d0ca
Signed-off-by: injun.yang <injun.yang@samsung.com>
Signed-off-by: DoHyun Pyun <dh79.pyun@samsung.com>