L2CAP: Add test script for pts test

*Add following PTS test script:
  L2CAP/COS/CED/BV-01-C
  L2CAP/COS/CED/BV-03-C
  L2CAP/COS/CED/BV-04-C
  L2CAP/COS/CED/BV-05-C
  L2CAP/COS/CED/BV-07-C
  L2CAP/COS/CED/BV-08-C
  L2CAP/COS/CED/BV-09-C
  L2CAP/COS/CED/BV-11-C
  L2CAP/COS/CED/BI-01-C
  L2CAP/COS/CFD/BV-03-C
  L2CAP/COS/CFD/BV-08-C
  L2CAP/ERM/BI-01-C

*Add method FetchConnectionClose in facade to monitor connection closed

Test: run_pts_l2cap.sh

Change-Id: Ie1d6a84ada8344321307d215f304a8cb34ea2ad6