Fix swauth proxy config

Previously, the package for swauth of the swift
proxy was being added based on a variable that
was never set.

This commit updates that conditional to use the
correct variable.

manifests/proxy.pp

@@ -54,17 +54,17 @@ class swift::proxy(
     fail('Keystone is currently not supported, it should be supported soon :)')
   }
 
-  if($user_swauth) {
+  package { 'swift-proxy':
+    ensure => $package_ensure,
+  }
+
+  if($auth_type == 'swauth') {
     package { 'python-swauth':
       ensure  => $package_ensure,
       before  => Package['swift-proxy'],
     }
   }
 
-  package { 'swift-proxy':
-    ensure => $package_ensure,
-  }
-
   file { "/etc/swift/proxy-server.conf":
     ensure  => present,
     owner   => 'swift',