[services-ng] gracefully shutdown mysql server in warden

Change-Id: Id8c76ea7166f77609387ad2cc85f471bfe0f0b6f
[services-ng] bump src/services

  adapt govendor to be mongodb proxy package manager

  git shortlog a50377dd..f152a8d0
  Chunjie (2):
     [services-ng] modify mongodb proxy package reference
     [services-ng] remove log.Fatal function call since it invokes panic.

Change-Id: Idd78bd328bfb47145bcf5997dd6789c60c762e9d
Merge "[services-ng] bump src/services"
Merge "[services-ng] gracefully shutdown mysql server in warden"