tree ccea9754e6d8f7cbc7a82625423f29cf06bc5098
parent 890afe9d8507e1d06943bbd98a53cdcdb3f273fe
author Junxiao Shi <git@mail1.yoursunny.com> 1481837510 +0000
committer Junxiao Shi <git@mail1.yoursunny.com> 1481837510 +0000

tools: nfd-status-http-server returns HTTP 504 when NFD is not running

504 Gateway Timeout is a better HTTP response code than 200 OK
in this situation.

refs #3863

Change-Id: Ib41e07a8a33c5408cb8fcb2fe85c9d0f1bd1ed6b