LP2008252: Fix report output access when Shibboleth is enabled
When mod_shib is enabled use the ShibCompatValidUser option to ensure
report outputs load correctly.
Additionally, since it's SSO related, mention the sso_loc variable in
a comment for the apache config.
Signed-off-by: Jason Boyer <JBoyer@equinoxOLI.org> Signed-off-by: Jeff Davis <jeff.davis@bc.libraries.coop> Signed-off-by: Galen Charlton <gmc@equinoxOLI.org>