Reworking of networking code to enable Net Restart.

* Stun code now runs continually - to check external network state.
  * Udpsorter controls DHT stun is on/off. (via p3ConnectMgr)
  * added code to enable threads to join/restart 
  * enabled NetRestart for UDP and TCP.
  * tweaked networking code for faster startup (now ~30 seconds - can still be improved).
  * tweaked debug messages for testing networking
  * Added test for checking external IP address determination.



git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@1492 b45a01b8-16f6-495d-af2f-9b41ad6348cc

libretroshare/src/util/rsthreads.h

@@ -70,6 +70,8 @@ virtual ~RsThread() { return; }
 
 virtual void start() { createThread(*this); }
 virtual void run() = 0; /* called once the thread is started */
+virtual	void join(); /* waits for the the mTid thread to stop */
+virtual	void stop(); /* calls pthread_exit() */
 
 	pthread_t mTid;
         RsMutex   mMutex;