improve httpd management or add option to disable

[neoice]

we re-use Puppet PKI for https servers, typically something like this:

  SSLEngine on
  SSLCertificateFile      "/var/lib/puppet/ssl/certs/puppet-1601.pem"
  SSLCertificateKeyFile   "/var/lib/puppet/ssl/private_keys/puppet-1601.pem"
  SSLCertificateChainFile "/var/lib/puppet/ssl/ca/ca_crt.pem"
  SSLCACertificatePath    "/etc/pki/tls/certs"
  SSLCACertificateFile    "/var/lib/puppet/ssl/ca/ca_crt.pem"
  SSLCARevocationFile     "/var/lib/puppet/ssl/ca/ca_crl.pem"

I would like to either pass in SSL variables or a custom httpd template to the pulp::server class or pass in a parameter to skip httpd package install so I don't get resource conflicts when managing httpd with another class.