Add fastcgi external server defined type

After doing all of this I am wondering if the namespace should be changed. Perhaps apache::mod::fastcgi::server?
Not sure exactly what you're referring to but I find that hard to believe. In fact, someone merged another PR of mine recently and the tests passed fine. Puppet will complain about the alias variable name. Someone submitted a PR to address that [here](https://github.com/puppetlabs/puppetlabs-apache/pull/781).