excalibur: Detects whether a config file is acl or not and acts accordingly.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
(cherry picked from commit a1aa4a34e2f10dfb409a75aa2e48245917d4854d)
arthur.wsgi: Changed path to match the rest of the branch.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
(cherry picked from commit f07bbbd7a09132f7d8134fa547afea0f0ab7e5ce)
excalibur: acl and legacy store "reqexpire" in difference sections.

Signed-off-by: Martin Stone <martin@d7415.co.uk>
(cherry picked from commit 4d46a7e52836b4e59b276d0d94b5e05809df5c53)