user that is in default odoo configuration file is not present in...

 user that is in default odoo configuration file is not present in the database, so use another default

docker_dev_start.py

@@ -377,8 +377,6 @@
     arg = [
         'start',
     ]
-    if db_user:
-        arg.append('--db_user %s' % db_user)
     if db_password:
         arg.append('--db_password %s' % db_password)
     if nmspc.update:
@@ -504,6 +502,7 @@
     # default values if nothing else
     if not user:
         user = 'odoo'
+    arg.append('--db_user %s' % user)
     if not password:
         password = 'odoo'