Catch SSL errors due to timeouts in Github calls

Fixes 219378902/

buildtrigger/gitlabhandler.py

@@ -14,7 +14,7 @@ from buildtrigger.basehandler import BuildTriggerHandler
 
 from util.security.ssh import generate_ssh_keypair
 from util.dict_wrappers import JSONPathDict, SafeDictSetter
-from endpoints.exception import ExternalServiceTimeout
+from endpoints.exception import ExternalServiceError
 
 import gitlab
 import requests
@@ -78,7 +78,7 @@ def _catch_timeouts(func):
     except requests.exceptions.Timeout:
       msg = 'Request to the GitLab API timed out'
       logger.exception(msg)
-      raise ExternalServiceTimeout(msg)
+      raise ExternalServiceError(msg)
   return wrapper