[imp] changed logging to be like server

bzr revid: nicolas.vanhoren@openerp.com-20110929142919-v8pzr4zpy984e5qc

logging.json

@@ -2,7 +2,7 @@
     "version": 1,
     "formatters": {
         "simple": {
-            "format": "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+            "format": "[%(asctime)s] %(levelname)s:%(name)s:%(message)s"
         }
     },
     "handlers": {