Add ability to htpasswd (via -5) to produce non-obfuscated MD5 hashes.

mod_auth_digest's passwords can not be obfuscated by the APR magic
sequence (as we don't call apr_password_validate on them), therefore we
need a tool to produce true MD5 hex hashes.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@96737 13f79535-47bb-0310-9956-ffa450edef68