Those are all consumed by our parser, so they all support comments.
I was considering whether they should have a license header at all,
but in the end I decided to add it because those files are often created
by copying parts of real unit files. And if the real ones have a license,
then those might as well. It's easier to add it than to make an exception.
Cover the case where a service is recovered out of reloading state via
a restart Restart= configuration.
Signed-off-by: Peter Morrow <pemorrow@linux.microsoft.com>