[Pidgin] #15907: Remove discontinued Yahoo! functionality

[Pidgin]

#15907: Remove discontinued Yahoo! functionality
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 Reporter:  MarkDoliner  |       Owner:  EionRobb
     Type:  task         |      Status:  new
Milestone:  3.0.0        |   Component:  unclassified
  Version:               |  Resolution:
 Keywords:               |
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Comment (by mmcco):

 Apparently, all Yahoo federation has been dropped.

 The federation types we support along with their deprecation notices:
 * OPC/LPC
  * https://technet.microsoft.com/en-us/library/gg412817%28v=ocs.15%29.aspx
 * MSN
  * http://yahoomessenger.tumblr.com/post/53310509425/change-is-in-the-air-
 updates-to-yahoo-messenger
 * Pingbox
  * (same as MSN)
 * Sametime
  * http://www-01.ibm.com/support/docview.wss?uid=swg21449088

 I have a patch in the works. Just shaking out all the bugs. There are a
 ton of conditions checking for federation.

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Ticket URL: <https://developer.pidgin.im/ticket/15907#comment:3>
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