contint: file perms for qunit jobs

The qunit scripts will run as user jenkins-slave when tied to the
Jenkins Slaves. That needs us to tweak permissions of
/srv/localhost/qunit.

bug: 50231
Change-Id: I906908535b13b9cebe3efc11f26915cf17a3b8e9
Merge "contint: file perms for qunit jobs" into production