[2.4] Update rc.openrc.tmpl: a2boot and timelord depend on atalkd

[NJRoadfan]

We should only attempt to load timelord and a2boot if atalkd is running. Also register NBP entries on port 4 to be consistent with other init scripts.

[NJRoadfan]

The terminal output (at least on Alpine Linux) wouldn't look correct since the services stop in the reverse order.

Currently:

 * WARNING: you are stopping a boot service
 * Stopping afpd ...                                                                                              [ ok ]
 * Stopping papd ...                                                                                              [ ok ]
 * Stopping timelord ...                                                                                          [ ok ]
 * Stopping a2boot ...                                                                                            [ ok ]
 * Unregistering alpinetest:Workstation ...                                                                       [ ok ]
 * Unregistering alpinetest:netatalk ...                                                                          [ ok ]
 * Stopping atalkd ...                                                                                            [ ok ]
 * Stopping cnid_metad ...                                                                                        [ ok ]

There would be an awkward looking indent in the middle.

[rdmark]

Good point