bsc_vty: Add VTY command to test CTRL TRAP feature

Using this new command (introduced in OsmoBSC + OsmoNITB), you can
simulate the generation of TRAP events for testin purposes.

start the control interface monitor as an example client program:
	./openbsc/contrib/bsc_control.py -m -d localhost -p 4249

then start OsmoBSC or OsmoNITB, telnet to the VTY and enter 'enable'
mode and issue the following (example) command:
	ctrl-interface generate-trap my.foo.var 2342

As a result, on the bsc_control.py you will see:
	Got message: TRAP 0 my.foo.var 2342

Change-Id: Ib1d2ec38290dc94797c1b365d9b733e5215ab7d1
1 file changed