[Pidgin] #5215: XMPP: use feature discovery before using features

[Pidgin]

#5215: XMPP: use feature discovery before using features
-------------------+--------------------------------------------------------
Reporter:  urkle   |       Owner:  nwalp
    Type:  defect  |      Status:  new  
Priority:  minor   |   Component:  XMPP 
 Version:  2.4.0   |    Keywords:       
 Pending:  0       |  
-------------------+--------------------------------------------------------
 a request to the server retrieving what features it supports should be
 made and obeyed.  Example.

 <iq type='get' from='user at server.com' to='server.com' id='disco1'>
         <query xmlns='http://jabber.org/protocol/disco#info'/>
 </iq>

 which has a response of
 <iq to='user at server.com/Pidgin' from='server.com' type='result'
 id='disco1'>
         <query xmlns='http://jabber.org/protocol/disco#info'>
                 <identity category='server' type='im' name='myserver'/>
                 <feature var='http://jabber.org/protocol/disco#info'/>
                 <feature var='jabber:iq:time'/>
                 <feature var='urn:xmpp:time'/>
                 <feature var='vcard-temp'/>
         </query>
 </iq>

 Now if the server does not export the <feature var='urn:xmpp:ping'/>  then
 the client SHOULD NOT send xmpp ping requests (XEP 0199).

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Ticket URL: <http://developer.pidgin.im/ticket/5215>
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