Revert "ConnectionType.SOCKET_S2S is MINA based, so don't exlude it on start()"

This reverts commit f25491c7.

src/java/org/jivesoftware/openfire/spi/ConnectionListener.java

@@ -174,6 +174,7 @@ public class ConnectionListener
         // TODO Start all connection types here, by supplying more connection acceptors other than a MINA-based one.
         switch ( getType() )
         {
+            case SOCKET_S2S:
             case BOSH_C2S:
             case WEBADMIN:
                 Log.debug( "Not starting a (MINA-based) connection acceptor, as connections of type " + getType() + " depend on another IO technology.");