Add debug function

This allows for easier troubleshooting of invalid ACLs.

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

tests/matrix-apply-update.yaml

@@ -1,24 +0,0 @@
----
-user:user:rw:
-  args:
-    target_name: user
-    target_type: user
-    read: false
-    write: true
-  expect:
-    user:
-      user:
-        read: false
-        write: true
-        execute: false
-    group: &null_allfalse
-      null:
-        read: true
-        write: false
-        execute: false
-    mask: &null_ro
-      null:
-        read: true
-        write: true
-        execute: false
-    other: *null_allfalse