Merge remote-tracking branch 'origin/OF-2559_mina-to-netty' into OF-2…

…559_mina-to-netty

# Conflicts:
#	xmppserver/src/main/java/org/jivesoftware/openfire/net/RespondingServerStanzaHandler.java
#	xmppserver/src/main/java/org/jivesoftware/openfire/nio/NettyOutboundConnectionHandler.java
#	xmppserver/src/main/java/org/jivesoftware/openfire/nio/NettySessionInitializer.java
#	xmppserver/src/main/java/org/jivesoftware/openfire/session/LocalOutgoingServerSession.java
#	xmppserver/src/test/java/org/jivesoftware/openfire/session/LocalOutgoingServerSessionTest.java
#	xmppserver/src/test/java/org/jivesoftware/openfire/session/RemoteReceivingServerDummy.java