- Push warnings if des_encrypt or des_descrypt function fails because of out of resources or wrong params.
 - Push warning if des_encrypt or des_decrypt function is used when server is missing support for openssl.
 - Add test func_encrypt_nossl that is tun when the server is missing support for openssl. 


mysql-test/r/func_encrypt.result:
  Add tests for use of des_* function with invalid parameters
mysql-test/t/func_encrypt.test:
  Add tests for use of des_* function with invalid parameters
sql/item_strfunc.cc:
  Push warning if invalid paremeters are used
  Push warning if out of resources
  Push warning if user tries to use des_* function when the server has been compiled without support for openssl.