agent: ignore gathering failures on auto-generated IPs
Candidate gathering is stopped when discovery_add_local_host_candidate() returns HOST_CANDIDATE_CANT_CREATE_SOCKET. This may be too radical a measure when other local addresses can still be able to generate usable candidates. The issue was observed by a user who had an IPv6 address with tentative flag on one of the interfaces. That single failing address was causing the whole gathering process to end with no candidates found. Still, don't do this if nice_agent_add_local_address() has been called. In that case, the user really cares about the addresses and if there's any problem, the process should fail. https://phabricator.freedesktop.org/D1016
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