Use combined IPv4/IPv6 lookup from NetworkUtils
Remove unused code
Defer server connection until registering
Directly access the registrar connection
Remove a no longer thrown exception
Remove unused field accessors, inline proxy string generation
Remove dead code and unused exceptions
Move registrar expiration timeout to registrar connection class
Avoid unnecessary DNS lookups for SIP
Add mock libraries to classpath
Updates keepalive implementation to detect uplink drops. Use of XEP-0199 xmpp ping. Fix jabber authorization ignore.