Convert all HTML doc to RST

The motivation for this conversion is to have DevStack's docs be
generated using a more familair workflow for OpenStack projects, using
Sphinx.

Changing from raw HTML to RST will also make it easier to contribute
more documentation, as well as making edits less of a hassle.

The majority of the work was done by using Pandoc to convert from HTML
to RST, with minor edits to the output to remove errors in Sphinx.

Change-Id: I9636017965aeade37b950ddf5bdb0c22ab9004bd
Move to download.fedoraproject.org

download.fedoraproject.org is the mirror system, while
dl.fedoraproject.org is just one system. We have seen performance issues
with dl.fedoraproject.org and using download.fedoraproject.org was a
recommended as a solution by the folks at #fedora-admin.

Local testing on a rackspace server with dl.fedoraproject.org got about
70K/s while download.fedoraproject.org got over 1M/s

Move over to https as well.

Related-Bug: #1383928
Change-Id: I318d8844cfcfbc42c1e552e443c6b793d20f321f
Merge "Convert all HTML doc to RST"
Merge branch 'master' of https://github.com/openstack-dev/devstack