MGCP code hygiene
The libmgcp code (physically copied) is also used in cellmgr_ng and there are always phases of divergence and convergence.
The copy in cellmgr_ng has gained the concept of being able to block certain endpoints, this could now be merged back.
Also cellmgr_ng will now gain support for multiple virtual trunks and that should be merged back, in the long term it should be a separate library.
This is to remind myself.