Fixed a bunch of errors reported by Ron Bowes;

http://seclists.org/nmap-dev/2012/q2/639

nselib/ajp.lua

@@ -521,3 +521,5 @@ Helper = {
 	end,
 	
 }
+
+return _ENV;

nselib/xmpp.lua

@@ -121,7 +121,7 @@ XMPP = {
 					options = options or {},
 					auth = { mechs = {} } }
 		o.options.timeout = o.options.timeout and o.options.timeout or 10
-		o.servername = host.targetname or o.options.servername
+		o.servername = stdnse.get_hostname(host) or o.options.servername
 		setmetatable(o, self)
         self.__index = self
 		return o

scripts/afp-serverinfo.nse

@@ -73,7 +73,7 @@ action = function(host, port)
   -- get our data
   afp_proto = afp.Proto:new( { socket=socket } )
 
-  response = afp_proto:fp_get_server_info( socket )
+  local response = afp_proto:fp_get_server_info( socket )
   response = response.result
   
   -- all the server information is output in the order it occurs in the server