Code cleanup.
* mandos: Move some global stuff into classes.
(server, group): Moved into "AvahiService". All users changed.
(AvahiService.group, AvahiService.server): New attributes.
(entry_group_state_changed, server_state_changed): Moved into
"AvahiService".
All callers
changed.
(AvahiService.cleanup, AvahiService.activate): New.
(_datetime_to_dbus): Moved into "ClientDBus". All callers changed.
(ClientDBus._datetime_to_dbus): New.