BatchSpawnerBase: Move connect_to_job before DB commit and debug logging.

With this, the first database commit will already contain the forwarded port
if connect_to_job is used, and the log will show the correct port number.

Author: olifre

batchspawner/batchspawner.py

@@ -540,14 +540,15 @@ async def start(self):
             # store on user for pre-jupyterhub-0.7:
             self.user.server.port = self.port
             self.user.server.ip = self.ip
+
+        if self.connect_to_job_cmd:
+            await self.connect_to_job()
+
         self.db.commit()
         self.log.info("Notebook server job {0} started at {1}:{2}".format(
                         self.job_id, self.ip, self.port)
             )
 
-        if self.connect_to_job_cmd:
-            await self.connect_to_job()
-
         return self.ip, self.port
 
     async def stop(self, now=False):