There were a few tiny bugs plus some surprising behavior when specifying the
Livestatus socket for livedump/cmcdump. With this change, the rules are
simple and consistent now: If there is a -s/--socket commandline option, use
that. Otherwise derive the UNIX socket from the OMD_ROOT environment
variable if that is set (probably the common case). And finally: If there
is no -s/--socket option and no OMD_ROOT, complain and exit.
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