core (xmpp): add a server_jid property

sat/core/xmpp.py

@@ -849,6 +849,9 @@ class SatXMPPClient(SatXMPPEntity, wokkel_client.XMPPClient):
             xml_tools.quickNote(host_app, self, msg, _("Security notice"),
                 level = C.XMLUI_DATA_LVL_WARNING)
 
+    @property
+    def server_jid(self):
+        return jid.JID(self.jid.host)
 
     def _getPluginsList(self):
         for p in self.host_app.plugins.values():
@@ -1001,6 +1004,11 @@ class SatXMPPComponent(SatXMPPEntity, component.Component):
         component.Component.__init__(self, host, port, component_jid.full(), password)
         SatXMPPEntity.__init__(self, host_app, profile, max_retries)
 
+    @property
+    def server_jid(self):
+        # FIXME: not the best way to get server jid, maybe use config option?
+        return jid.JID(self.jid.host.split(".", 1)[-1])
+
     def _buildDependencies(self, current, plugins, required=True):
         """build recursively dependencies needed for a plugin