Stage tools51.nasqueron.org

Summary:
Provision /var/51-wwwroot with *51.domain.tld sites.

The idea is to allow more easily to chmod home directories as 700,
storing elsewhere any content reachable by another user, like here
a repository with a staging version of a website.

The queer directory name avoids autocomplete issue on wwwr<tab>.

Test Plan: Ensure /var/51-wwwroot/tools contains a valid clone of rTOOLS.

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D1291