Don't log "ngIRCd hello message" two times

Start "regular" logging not until the configuration file has been read in
and "SyslolgFacility" is set, and log all configuration errors using the
generic "daemon" facility.

So if there are no configuration errors, logging starts right after parsing
the configuration and we log the configuration file used _after_ reading it.
But this is no problem because every configuration error message includes
the configuration file name as well.

(The "double hello" has been introduced by commit 3641e5110952)

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