Add similar extra logging for localhost handler

* This also adjusts the logging in Session.auth_callback() because it
  can be called from either protocol.  Saying 'edmc://' there is
  misleading.

companion.py

@@ -437,8 +437,8 @@ class Session(object):
 
     # Callback from protocol handler
     def auth_callback(self) -> None:
-        """Handle callback from edmc:// handler."""
-        logger.debug('Handling callback from edmc:// handler')
+        """Handle callback from edmc:// or localhost:/auth handler."""
+        logger.debug('Handling auth callback')
         if self.state != Session.STATE_AUTH:
             # Shouldn't be getting a callback
             logger.debug('Got an auth callback while not doing auth')

protocol.py

@@ -36,6 +36,7 @@ class GenericProtocolHandler(object):
     def event(self, url):
         self.lastpayload = url
 
+        logger.trace(f'Payload: {self.lastpayload}')
         if not config.shutting_down:
             logger.debug('event_generate("<<CompanionAuthEvent>>"')
             self.master.event_generate('<<CompanionAuthEvent>>', when="tail")
@@ -247,8 +248,10 @@ else:	# Linux / Run from source
     class HTTPRequestHandler(BaseHTTPRequestHandler):
 
         def parse(self):
+            logger.trace(f'Got message on path: {self.path}')
             url = urllib.parse.unquote(self.path)
             if url.startswith('/auth'):
+                logger.debug('Request starts with /auth, sending to protocolhandler.event()')
                 protocolhandler.event(url)
                 self.send_response(200)
                 return True