MDL-49533 repository: Remove the Alfresco plugin

The SDK that this plugin was designed around is not compatible with recent
versions of Alfresco so the decisio has been made to move the repository to
the plugins database.

lib/classes/plugin_manager.php

@@ -1661,6 +1661,7 @@ class core_plugin_manager {
             'qformat' => array('blackboard', 'learnwise'),
             'enrol' => array('authorize'),
             'report' => array('search'),
+            'repository' => array('alfresco'),
             'tinymce' => array('dragmath'),
             'tool' => array('bloglevelupgrade', 'qeupgradehelper', 'timezoneimport'),
             'theme' => array('mymobile', 'afterburner', 'anomaly', 'arialist', 'binarius', 'boxxie', 'brick', 'formal_white',
@@ -1876,7 +1877,7 @@ class core_plugin_manager {
             ),
 
             'repository' => array(
-                'alfresco', 'areafiles', 'boxnet', 'coursefiles', 'dropbox', 'equella', 'filesystem',
+                'areafiles', 'boxnet', 'coursefiles', 'dropbox', 'equella', 'filesystem',
                 'flickr', 'flickr_public', 'googledocs', 'local', 'merlot',
                 'picasa', 'recent', 'skydrive', 's3', 'upload', 'url', 'user', 'webdav',
                 'wikimedia', 'youtube'