Forward NICKDELAY as RESV to non-EUID servers

[cooper]

• NICKDELAY: ratbox does not support a nick delay command, which is used by
  services to prevent users from switching back to a nickname immediately after
  services forced them to a "Guest" nick. When linking ratbox to services, RESV
  is used instead, but if ratbox reaches services indirectly via juno, it cannot
  understand the NICKDELAY command that is forwarded to it. There are plans to fix
  this by specially translating NICKDELAY to RESV for ratbox (or any server
  without EUID).

[cooper]

Hmm, this would require a ban agent to send out RESVs, so it depends on #119 being addressed first

[cooper]

OK this is done. Lots of hacks. NICKDELAY may be forwarded as ENCAP RESV, RESV, or even BAN R (but probably not) to servers not supporting EUID. If a RESV command has to be used, juno will look for NickServ according to services:nickserv config key.