Authorization files: change back to the defaults used in upstream

* Switched AUTHORIZE_FILE back to /.authorize
** Added some logic to let you override by setting
   -DAUTHORIZE_FILE="/someotherpath" when compiling
** Updated the RPM specfile to set it to the more RHEL-friendly path
* Switched AFSCONF_CLIENTNAME back to /etc/openafs
** Added some logic to let you override by setting
   -DAFSCONF_CLIENTNAME="/someotherpath" when compiling
** The OpenAFS packages put it in /usr/vice/etc