Introduce public_url, internal_url and admin_url

This change deprecates the following parameters:
- public_protocol (replaced by public_url)
- public_address (replaced by public_url)
- public_port (replaced by public_url)
- internal_address (replaced by internal_url)
- internal_port (replaced by internal_url)
- admin_address (replaced by admin_url)
- admin_port (replaced by admin_url)

Add deprecation warnings if any of those values are provided
while maintaining full backward compatibility.

Closes-bug: #1274979
Change-Id: If5b0ae003726c5a99b3a2e22b2aafe1a178bb170
Merge git://github.com/puppetlabs/puppetlabs-keystone