[master] 90946ab Merge pull request #1886 from aondio/adm_be_health

[arianna-aondio]

commit 90946abdb93253b890cd14cf7a7b5d8d1f5f09ea
Merge: 67d5739 977f15c
Author: arianna-aondio <arianna.aondio at varnish-software.com>
Date:   Mon Mar 21 13:37:09 2016 +0100

    Merge pull request #1886 from aondio/adm_be_health
    
    Add "last updated" timestamp for backend health in varnishadm