Enable serving keystone from apache mod_wsgi

Serving keystone from a wsgi container is recommended for production
setups. SSL is enabled by default.

See the following URLs for explanations:
    http://adam.younglogic.com/2012/03/keystone-should-move-to-apache-httpd/
    https://etherpad.openstack.org/havana-keystone-performance

Documentation in manifests/wsgi/apache.pp

Apache can be configured as a drop in replacement for keystone (using
    ports 5000 & 35357) or with paths using the standard SSL port. See
examples in examples/apache_*.pp

- Also change some 'real_' prefix into '_real' suffix to respect the
coding guide.
- Added the '--insecure' option to keystone client in the provider to
allow using self-signed certificates.
- Fixed parsing the ssl/enable value in the provider.

There is no integer verification done in the manifests
and to get around a bug in rspec, which has been fixed
in https://github.com/rodjek/rspec-puppet/pull/107,
certain parameters that should be integer are treated as
strings

files/httpd/keystone.py updated with lastest from keystone git repo

Change-Id: Ide8c090d105c1ea75a14939f5e8ddb7d24ca3f1c