Add AbstractXMPPConnection.initState()

and init/reset the sychronization points there.

This method is called right at the beginning of connect() and at the
end of shutdown().

smack-tcp/src/main/java/org/jivesoftware/smack/tcp/XMPPTCPConnection.java

@@ -534,6 +534,12 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
         reader = null;
         writer = null;
 
+        initState();
+    }
+
+    @Override
+    protected void initState() {
+        super.initState();
         maybeCompressFeaturesReceived.init();
         compressSyncPoint.init();
         smResumedSyncPoint.init();