lib: fix access-list entry update

lib: fix access-list entry update

When an access-list entry is updated, current NB code calls notification
hooks for each updated field. It means that when multiple fields of an
entry are changed in a single commit, the hooks are run with an interim
state of an access-list instead of a final one. To fix the issue, we
should call the hooks once, after all fields of an entry are updated.

Signed-off-by: Igor Ryzhov <iryzhov@nfware.com>