Land rapid7#7356, remove SSH interactive prompt from freesshd_authbypass

Author: Brent Cook

modules/exploits/windows/ssh/freesshd_authbypass.rb

@@ -107,7 +107,8 @@ def setup_ssh_options
       :port     => datastore['RPORT'],
       :timeout  => 1,
       :proxies  => datastore['Proxies'],
-      :key_data => OpenSSL::PKey::RSA.new(2048).to_pem
+      :key_data => OpenSSL::PKey::RSA.new(2048).to_pem,
+      :auth_methods => ['publickey']
     }
     return options
   end