Handle WHOIS messages in our test IRC server
Handle WHOIS messages in our test IRC server

The following numeric replies are supported:
+ RPL_WHOISUSER
+ RPL_WHOISCHANNELS
+ RPL_WHOISSERVER
+ RPL_WHOISSECURE
+ RPL_WHOISHOST
+ RPL_WHOISIDLE
+ RPL_WHOISLOGGEDIN
+ RPL_ENDOFWHOIS
+ RPL_TRYAGAIN
+ ERR_NOSUCHSERVER

Known problems:
+ RPL_AWAY is not supported.

Fixes: https://bugs.freedesktop.org/34796

freedesktop-unofficial-mirror/telepathy__telepathy-idle,freedesktop-unofficial-mirror/telepathy__telepathy-idle,freedesktop-unofficial-mirror/telepathy__telepathy-idle