Description: The command FLUSH DES_KEY_FILE is expected to
reload the DES keys from the file that was specified with
the "--des-key-file" option at server startup. But it is not
behaving as expected.

Analysis: The des file reload is defined within a wrong
conditional directive, rendering the command ineffective.
Macro "OPENSSL" was used instead of "HAVE_OPENSSL" macro.

Fix: "OPENSSL" macro is changed to "HAVE_OPENSSL".