(MODULES-2458) Support for mod_auth_mellon.

[traylenator]

mod_auth_melon is an authentication module
for apache. Configurations such as the following
are now supported.

class{'apache':
      default_mods        => false,
      default_confd_files => false,
      default_vhost       => false,
}
class{'apache::mod::auth_mellon':
     mellon_cache_size => 101
}
apache::vhost{$::fqdn:
  docroot => '/var/www/html',
  port    => 443,
  ssl     => true,
  ssl_key => "/etc/certs/${::fqdn}.key",
  ssl_cert => "/etc/certs/${::fqdn}.cert",
  directories => [
      {  path           => '/',
         provider       => 'directory',
         mellon_enable  => 'info',
         mellon_merge_env_vars => 'On',
         mellon_endpoint_path => '/mellon',
         mellon_sp_private_key_file => "/etc/certs/${::fqdn}.key",
         mellon_sp_cert_file => "/etc/certs/${::fqdn}.cert",
         mellon_idp_metadata_file => "/etc/httpd/conf.d/mellon/FederationMetadata.xml",
         mellon_set_env_no_prefix => { "user" => "http://schemas.xmlsoap.org/claims/UPN",
                                   "ADFS_GROUP" => "http://schemas.xmlsoap.org/claims/Group",
                                   "ADFS_EMAIL" => "http://schemas.xmlsoap.org/claims/EmailAddress"},
         mellon_user => 'ADFS_LOGIN',
      },
      { path => '/protected',
        provider => 'location',
        auth_type => 'Mellon',
        auth_require => 'valid-user',
        mellon_enable => 'auth',
        mellon_cond => ['ADFS_LOGIN straylen [MAP]']
      },
  ]
}

[underscorgan]

Thanks @traylenator !