As part of allowing projects to establish redirects when they move
documentation pages around, we need to let them use .htaccess files.
We only want to allow Redirect and RedirectMatch directives,
though. This change restricts the directives on docs.o.o and adds them
on the static servers used for drafts published during a build (to
allow testing of the redirects).
For more details see:
http://lists.openstack.org/pipermail/openstack-dev/2017-July/120240.html
Change-Id: I256d69f08499549e9e21179eb89f49cda79f7ac7
