Remove extension which are git submodules

We cannot clone in these git repos because they are already git
submodules which are checked out for us and you can't clone a git repo
into a dir that exists. It seems that at some point the extensions that
have been removed from our list here have made it into mediawiki's
default extension list.

Change-Id: Ibdf565506bef68a7d297fc73935ef817ef9d24e5

manifests/init.pp

@@ -63,22 +63,16 @@ class mediawiki(
     include ::mediawiki::php
     include ::mediawiki::app
 
-    mediawiki::extension { [ 'ConfirmEdit',
+    mediawiki::extension {
+      [
         'OpenID',
-        'Renameuser',
-        'WikiEditor',
         'CodeEditor',
         'Scribunto',
-        'Gadgets',
         'CategoryTree',
-        'ParserFunctions',
-        'SyntaxHighlight_GeSHi',
-        'Cite',
         'cldr',
         'Babel',
         'Translate',
         'Collection',
-        'Nuke',
         'AntiSpoof',
         'Mantle',
         'MobileFrontend',
@@ -89,8 +83,8 @@ class mediawiki(
         'UniversalLanguageSelector',
         'Elastica',
         'CirrusSearch',
-        'SpamBlacklist',
-        'SmiteSpam' ]:
+        'SmiteSpam'
+      ]:
     }
 
     mediawiki::extension { 'EmbedVideo':