Use /srv/data instead of /data

Summary:
Containerized OS or OS mounted as read-only don't allow to write
in every folder.

The new Docker Engine is a project atomic one, where it will be
more convenient to use /srv/data.

Fixes T1261.

Test Plan: salt dwellers.nasqueron.org state.apply hotfixes

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1261

Differential Revision: https://devcentral.nasqueron.org/D1065