AppArmor: Fix error returned when a path lookup is disconnected

AppArmor: Fix error returned when a path lookup is disconnected

The returning of -ESATLE when a path lookup fails as disconnected is wrong.
Since AppArmor is rejecting the access return -EACCES instead.

This also fixes a bug in complain (learning) mode where disconnected paths
are denied because -ESTALE errors are not ignored causing failures that
can change application behavior.

Signed-off-by: John Johansen <john.johansen@canonical.com>
(cherry picked from commit ef9a762279c9ce98c592fb144b31898411feb94d)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>