Floss: Reject unbonded device connection more aggresively

There is still some chance for an unbonded device to stay connected
even though we are actively starts the disconnection, if some race
occurs.

Disconnect more aggresively on certain states.

Bug: 293447040
Tag: #floss
Test: Purposely add delay in the media profile removal step and
      ensure connection initiated by an unbonded headsets is closed.
Change-Id: I924c1121069f8c1786c7ab20429ccac2201c68be