Adds bootstrapping of Keystone admin user

* We use a bootstrap_token only to set up the keystone
  admin user in a bash script. Though the token does
  get written to the conf file, there's nothing we can
  do about it, other than removing the admin_token_auth
  middleware from the service API endpoint app pipeline
Merge pull request #23 from jaypipes/working

Adds bootstrapping of Keystone admin user