[Bug 94812] New: implement finish_initial_candidates method

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94812

            Bug ID: 94812
           Summary: implement finish_initial_candidates method
           Product: Telepathy
           Version: git master
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: gabble
          Assignee: telepathy-bugs at lists.freedesktop.org
          Reporter: fabrice at bellet.info
        QA Contact: telepathy-bugs at lists.freedesktop.org

This patch modifies the way candidates are sent in jingle transport for the ICE
udp protocol: IMO the candidates should be sent in a single batch after all
local candidates have been collected. This is important for the ICE connection
checking algorithm to work because it assumes that all local (and remote)
candidates have been exchanged before starting the stun requests. Proper
ordering of pair to be checked depends on this.

Currently, candidates for ICE are sent to the peer as soon as they are
collected, one per callback. And the connection check on the peer consequently
begins with a partial list of remote candidates. The rest of the remote
candidates usually arrive much later, with a delay caused by the transit via
the xmpp server.

This patch implements the finish_initial_candidates method, and uses it in
wocky-jingle-transport-iceudp, to call send_candidates() just one time, after
all initial local candidates have been collected. It makes the ice algorithm to
converge much more quickly.

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