Sometimes people might join the channel uncloaked and get join-flood banned
with their uncloaked hostmask, and then later attempt to join the channel while
cloaked but the network will prevent them from joining since it checks their IP
address against the banlist in addition to their cloak.
Attempts to use unbanme while cloaked will look for a ban matching the cloak
instead of the IP address and will not find their uncloaked join-flood ban.
To fix this, we now traverse all known aliases/hostmasks for an individual
requesting a join-flood unban and remove any and all bans matching any of the
hostmasks linked to this individual.
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