Rework file trigger scripts to fire at the right time

This turns out to be more complicated than it looked initially...
%transfiletriggerun is called early, while %transfiletriggerin is
called late, and neither satifisfies the requirement to call
daemon-reload after new unit files have been installed, but before
%postun scripts in packages get to fire.

It seems that the only solution is to use %filetriggerun (which
is called once per package) to do the reload, and keep state in
/var/lib/rpm-state/systemd/ to avoid calling the reload multiple
times.

https://fedoraproject.org/wiki/Packaging:ScriptletSnippets#Saving_state_between_scriptlets
says that /var/lib/rpm-state/systemd/ is the right dir.

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