Cleanup WSGI config for keystone on stop

Ensure that the VHOST and the scripts used to enable keystone under
mod_wsgi are properly cleaned up.

Change-Id: I76a748b0fd5f1a5182d10e425202857c5621e25a
Run all-in-one instead of sahara-api

We're upgrading sahara architecture, so, we've added an alias to run
sahara in all-in-one process.

Change-Id: I7f92e13c1a9b15070c5ec46428ca3949190abfc9
Merge "Run all-in-one instead of sahara-api"
Merge "Cleanup WSGI config for keystone on stop"
Merge branch 'master' of https://github.com/openstack-dev/devstack