Disconnect after making the HTTP transaction in send_request_cgi

Add a disconnect call after cgi is done.

Author: jinq102030

lib/msf/core/exploit/http/client.rb

@@ -366,7 +366,7 @@ def send_request_cgi(opts={}, timeout = 20)
         print_line('#' * 20)
         print_line(res.to_s)
       end
-
+      disconnect(c)
       res
     rescue ::Errno::EPIPE, ::Timeout::Error => e
       print_line(e.message) if datastore['HttpTrace']