Fix memory leak when reconfiguring multiline all-of ACLs (#1425)

Fix memory leak when reconfiguring multiline all-of ACLs (#1425)

Normally, Acl::InnerNode::add() automatically registers stored ACL nodes
for future cleanup, but when we find the second all-of rule/line (with
the same ACL name), we do not add() the newly created OrNode and have to
explicitly register it to avoid memory leaks on reconfiguration.

Leaking since all-of ACL support was added in 2013 commit 6f58d7d.