* tests/test-vc-list-files-cvs.sh: Invoke "$srcdir/init.sh" and
path_prepend_.
Use Exit, not exit.
Use skip_ rather than open coding it.
Remove trap set-up and compare definitions.
* tests/test-vc-list-files-git.sh: Likewise.
* modules/vc-list-files-tests (Files): Add tests/init.sh.
* modules/vc-list-files-tests (configure.ac):
Define and AC_SUBST abs_aux_dir.
(Makefile.am) [TESTS_ENVIRONMENT]: Rather than passing
$(abs_top_srcdir) to each script and having each of them
duplicate the work of setting PATH, set PATH here, using
the new variable, abs_aux_dir instead.
* tests/test-vc-list-files-cvs.sh: Don't set PATH here.
* tests/test-vc-list-files-git.sh: Likewise.
Reported by Bruno Haible.