Like all other log.c just exit(1) in fatal()

From a syslog perspective it does not make sense to log fatal and
warn with the same severity. Switch log_warn() to LOG_ERR and keep
fatal() at LOG_CRIT.
OK reyk@ florian@

work on making log.c similar in all daemons:

move daemon-local functions into new logmsg.c, and reduce
the (mostly whitespace) differences so that log.c's can be diffed easily.

ok claudio@

Convert the logic in yyerror(). Instead of creating a temporary
format string, create a temporary message.
OK benno@ doug@ claudio@

Decouple log_verbose() from log_init() so the verbose flag stays set with
"-v" (previously only "-vd" worked). Similar to recent ospfd commit.
ok claudio@

Yet another implementation of IMSG_CTL_LOG_VERBOSE. Similar to the one in
ripd, ospfd and friends. OK michele, henning, sthen

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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