Merge pull request #566 from edx/will/devstack-base-box

Set devstack base box to empanada release (RC)
Merge remote-tracking branch 'origin/master' into rc/empanada
Merge remote-tracking branch 'origin' into rc/empanada
Merge pull request #561 from edx/rc/empanada

Rc/empanada
change to chmod as privileged user.
edxapp-git-auth: allow authenticated edx-platform/edx-theme checkouts
Merge pull request #729 from edx/jarv/focaccia

Jarv/focaccia
Merge branch 'master' into release
Changes to make the forums run using unicorn and
unix sockets.
fix permissions.
Test changes.
Use the clustering logic we use with rabbit.
Set the hosts like elasticsearch expects.
A play to build the elasticsearch server.
Setting default username to root and defalut db name to edxapp.
Merge pull request #734 from edx/feanil/update_cloudformation

Setting default username to root and defalut db name to edxapp.
edxapp-git-auth: Add `EDXAPP_USE_GIT_IDENTITY` boolean to switch on/off

Using `EDXAPP_LOCAL_GIT_IDENTITY` gives parsing errors during evaluation for paths
Adding template for defaults.
Moving template to standard structure.
Moved, removing.