puppet: Fix apache dependencies

(imported from commit 340dde4d045da17dcc7dab492a6fc12e0df3539c)

servers/puppet/modules/humbug/manifests/apache.pp

@@ -4,9 +4,11 @@ class humbug::apache {
 
   apache2mod { [ "headers", "proxy", "proxy_http", "rewrite", "auth_digest", "ssl" ]:
     ensure  => present,
+    require => Package['apache2'],
   }
 
   file { "/etc/apache2/users/":
+    require => Package['apache2'],
     ensure   => directory,
     owner    => "www-data",
     group    => "www-data",
@@ -23,6 +25,7 @@ class humbug::apache {
   }
 
   file { "/etc/apache2/certs/":
+    require => Package['apache2'],
     ensure => directory,
     owner => "root",
     group => "root",