kete: improve some messaging

In the normal mode (without -v) we'd see the errors, but not the messages when
we reconnect. Elevate the "connected to" message to info so it shows up.

And slight rewording, which may or may not be better.

tools/tuhi-kete.py

@@ -584,14 +584,14 @@ class TuhiKeteShell(cmd.Cmd):
         return names
 
     def _on_name_appeared(self, connection, name, client):
-        logger.debug('Tuhi daemon is up and running')
+        logger.info('Connected to the Tuhi daemon')
         self._manager = TuhiKeteManager()
 
     def _on_name_vanished(self, connection, name):
         if self._manager is not None:
-            logger.error('Tuhi daemon went away')
+            logger.error('Tuhi daemon has quit')
         else:
-            logger.warning('Tuhi daemon not started')
+            logger.warning('Tuhi daemon not running')
         self.terminate_workers()
         if self._manager is not None:
             self._manager.terminate()