kete: rename 'list' command into 'devices'

'list' and 'listen' are just too close to each other, meaning the
completion stops at 'list' while the lazy developer/tester want to
do a 'listen'.

Change the name of the less used command so we have separate spaces
for completion

tools/tuhi-kete.py

@@ -620,7 +620,7 @@ class TuhiKeteShell(cmd.Cmd):
         worker.run()
         self._workers.append(worker)
 
-    def do_list(self, arg):
+    def do_devices(self, arg):
         '''List known devices. These are devices previously paired with the daemon.'''
         logger.debug('Listing available devices:')
         for d in self._manager.devices: