Cleanup control like in the other routing daemons. Move control_state
and ctl_conns to control.c cleanup headers and the engine accordingly.

Oups forgot to remove the enums

Kill another session_socket_blockmode() ... 6 or so to go.

Handle file descriptor exhaustion in the accept() case.
ok claudio

make dvmrpd imsg-in-a-lib ready as well.
``put it in'' claudio@, ok eric@

Welcome dvmrpd
started by Esben Norby some time ago by using the imsg/three process framework
of ospfd.
Right now it is not particularly useful, major parts are still missing but is
imported to allow

Welcome dvmrpd
started by Esben Norby some time ago by using the imsg/three process framework
of ospfd.
Right now it is not particularly useful, major parts are still missing but is
imported to allow more people to work on it.

Status:

The IGMP part is mostly complete, allowing clients to join and leave groups.
Election the IGMP querier of a network is also functional, only thing missing is
some corner cases when going from non-querier to querier.

About half of the DVMRP is functional, probes and route reports are functional.

Multicast streams can be detected and the MFC can be manipulated.
The RIB is not complete but operational.

Not yet connected to the builds.

OK claudio@

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