Comment # 17 on bug 1117483 from Franck Bui

(In reply to Jaime Caama�o Ruiz from comment #16)
> %service_del_postun macro accepts parameter -n to same effect. But the
> result is not very explicit, arguably less than the environment variable :(

That's one of the reason why I would prefer introducing something like
"%service_del_postun_without_restart" which should be a hint that it's not the
default macros in %postun to use and would allow at least get rid of the global
environment variable.

And IIRC openvswitch was one of the few users, hence this BZ report.