There are some situations in which osmo-bsc releases a call without
sending a DLCX to the media gateway. The 'laforge/fsm' has a more
proper solution to the problem, this is an interim hack which just
sends an unsolicited DLCX before the CRCX.
Change-Id: I1a78721d3d0a2f4a99cfddade2d06732f0388c30