fixes #1509 - Foreman should use the proxy to import puppet classes

Fixes #609 - Orchestrate puppetca operations

This also includes adding support for a puppet smart-proxy target type
and providing migration support
Updated to provide backward compatability for host and hostgroup objects
Now terminates the build and incorporates other fixes...

Fixes #65, Fixes #339 and Fixes #539

• Smart proxy CRUD within Foreman
• Subnet operations
  • CRUD
  • Finding the next free IP (via the dhcp proxy)
• Association of subnets, domains to proxies (dns, dhcp and tftp)