Now can clone from zuul using apache 2.4

In I734b5c45e1e088364328e9fc5ec5932d3bfe32c5 support was added to run
zuul on trusty, except that cloning didn't work. These changes update
the vhost configuration to allow that.

Change-Id: I70d814a5eaefea5a3fb6a47bc215f4ab64be884f

manifests/init.pp

@@ -347,6 +347,11 @@ class zuul (
       ensure => present,
     }
   }
+  if ! defined(A2mod['cgi']) {
+    a2mod { 'cgi':
+      ensure => present,
+    }
+  }
 
   case $::lsbdistcodename {
     'precise': {

templates/zuul.vhost.erb

@@ -7,6 +7,10 @@
     Allow from all
     Satisfy Any
   </Directory>
+  <Directory /usr/lib/git-core>
+    Allow from all
+    Satisfy Any
+  </Directory>
 
   ErrorLog ${APACHE_LOG_DIR}/<%= scope.lookupvar("::zuul::vhost_name") %>-error.log