Introduce two new bool, to know if the xmpp component should try to reconnect

If we never succeeded our connection+auth process, means we should probably
not attempt any-more, and just give up.  If we ever did, this means a
reconnect is a good idea

src/xmpp/xmpp_component.hpp

@@ -140,6 +140,15 @@ public:
   void handle_iq(const Stanza& stanza);
   void handle_error(const Stanza& stanza);
 
+  /**
+   * Whether or not we ever succeeded our authentication to the XMPP server
+   */
+  bool ever_auth;
+  /**
+   * Whether or not the last connection+auth attempt was successful
+   */
+  bool last_auth;
+
 private:
   /**
    * Return the bridge associated with the given full JID. Create a new one