PHP module shouldnt zap CMD option (@wchen-r7)

As far as I can tell, there is no purpose for this cleanup. No other CMD
exec module takes pains to clear out CMD after run, and it looks like a
bad idea -- what happens when you rexploit?

modules/exploits/multi/http/phpldapadmin_query_engine.rb

@@ -87,13 +87,6 @@ class Metasploit3 < Msf::Exploit::Remote
     return res.get_cookies
   end
 
-  def cleanup
-    # We may not be using php/exe again, so clear the CMD option
-    if datastore['CMD']
-      datastore['CMD'] = nil
-    end
-  end
-
   def exploit
     # if we are using the exec CMD stager
     # important to check which php functions are disabled