This patch adds some logic that is currently duplicated throughout
Openstack. As part of this de-duplication, the patch also modifies
current implementation.

Major Changes:
    * check, set_rules, reset, init are now part of the Enforcer class
    * check was renamed into enforce
    * init was renamed into load_rules
    * It is now possible to load multiple files and have per instance
      rules instead of global rules.
    * There's a global instance of the Enforcer class that can be used as
      main enforcer.

        from openstack.common import policy
        ENFORCER = policy.ENFORCER
        ENFORCER.enforce(rule, target, creds)

Minor Changes:
    * Added do_raise to the enforce method
    * Enforcer instance is now passed to the Check call.

NOTE: If / once this patch gets in, I'll update other projects and port
them to the latest version.

Change-Id: Ife909bdf3277ef33c2fb1eae16ae261fa6374c63

Enable support for SSL as well using code from glance. We
have some new options for configuring the SSL support.

test_app starts wsgi.Service with a test app, then creates
a url to make sure the http requests are actually served
properly

test_app_using_router adds wsgi.Router and Mapper() to the
mix along with using the wsgify annotation for serving
the http requests

Fixes LP# 979488 (partial)
Fixes LP# 869884 (partial)

DocImpact

Change-Id: Iae47b13b50e00c102c8c36f4a3e73b24fa4e6303