MDL-29509 move spamcleaner to admin tools

Why? Because this tool does not support contexts, allows data modifications and is intended only for admins. It is still linked from admin reports for now, we will move it elsewhere once we know where to add general new reports.

AMOS BEGIN
 MOV [pluginname,report_spamcleaner],[pluginname,tool_spamcleaner]
 MOV [spamauto,report_spamcleaner],[spamauto,tool_spamcleaner]
 MOV [spamcannotdelete,report_spamcleaner],[spamcannotdelete,tool_spamcleaner]
 MOV [spamcannotfinduser,report_spamcleaner],[spamcannotfinduser,tool_spamcleaner]
 MOV [spamcleanerintro,report_spamcleaner],[spamcleanerintro,tool_spamcleaner]
 MOV [spamdeleteall,report_spamcleaner],[spamdeleteall,tool_spamcleaner]
 MOV [spamdeleteallconfirm,report_spamcleaner],[spamdeleteallconfirm,tool_spamcleaner]
 MOV [spamdeleteconfirm,report_spamcleaner],[spamdeleteconfirm,tool_spamcleaner]
 MOV [spamdesc,report_spamcleaner],[spamdesc,tool_spamcleaner]
 MOV [spameg,report_spamcleaner],[spameg,tool_spamcleaner]
 MOV [spamfromblog,report_spamcleaner],[spamfromblog,tool_spamcleaner]
 MOV [spaminvalidresult,report_spamcleaner],[spaminvalidresult,tool_spamcleaner]
 MOV [spamoperation,report_spamcleaner],[spamoperation,tool_spamcleaner]
 MOV [spamresult,report_spamcleaner],[spamresult,tool_spamcleaner]
 MOV [spamsearch,report_spamcleaner],[spamsearch,tool_spamcleaner]
AMOS END

lib/pluginlib.php

@@ -342,8 +342,7 @@ class plugin_manager {
 
             'report' => array(
                 'backups', 'configlog', 'courseoverview',
-                'log', 'questioninstances',
-                'security', 'spamcleaner', 'stats'
+                'log', 'questioninstances', 'security', 'stats'
             ),
 
             'repository' => array(
@@ -368,7 +367,8 @@ class plugin_manager {
             'tool' => array(
                 'bloglevelupgrade', 'capability', 'customlang', 'dbtransfer', 'generator',
                 'health', 'innodb', 'langimport', 'multilangupgrade', 'profiling',
-                'qeupgradehelper', 'unittest', 'uploaduser', 'unsuproles', 'xmldb'
+                'qeupgradehelper', 'spamcleaner', 'unittest', 'uploaduser', 'unsuproles',
+                'xmldb'
             ),
 
             'webservice' => array(