Use nova.conf for auth_token configs.

Updates lib/nova so that we use the application config file (nova.conf)
instead of the Nova api-paste.ini config file.

Related-Bug #1240753

Change-Id: I393a67f1f005e775928130c9241aa7e25c391ae3
Use cinder.conf for auth_token configs.

Updates lib/cinder so that we use the application config file (cinder.conf)
instead of the Cinder api-paste.ini config file.

Related-Bug #1240753

Change-Id: I6636d33ee522757145ac97fc354324a8b9379700
Create-stack-user script should have execute permissions

Currently running stack.sh as root advises you about this script, which is not
executable

Change-Id: I674af044b8f3c31bcc86be5c6552e8086453d5cd
Merge "Use cinder.conf for auth_token configs."
Merge "Use nova.conf for auth_token configs."
Merge branch 'akanda/havana.2' of github.com:dhellmann/devstack into akanda/havana.2