Stop warning on extra spaces in BindPaths= and BindReadOnlyPaths=.
Keep bind path parsing and serialization consistent.
Fixes: #43214
(cherry picked from commit 507ba1e51c)
(cherry picked from commit a032efe141)
(cherry picked from commit 6e1f31cb99)
(cherry picked from commit af9219c383)
We want to retain *some* of the full paths in order to test more code paths.
But the default should be to use the command name only. This makes the tests
less visually cluttered.
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.
dongshengyuan