icinga-wm - configure to also serve #wikidata

make icinga-wm join #wikidata and output
stuff from the custom log for wikidata,
which should only contain services with the
irc-wikidata contact, NOT all services like
in the -operations channel

Bug: 65291
Change-Id: I2bc601991aae2c1a0a4ad72da923936cb4950c37
Merge "icinga-wm - configure to also serve #wikidata" into production