test-framework-sh: port to NetBSD 7.0 Problem reported by Assaf Gordon in: http://bugs.gnu.org/23107#13 * tests/init.sh (testdir_prefix_, pfx_, template_length_): Remove. All uses removed. (test_dir_): Adjust to mktempd_ change. (mktempd_): Omit 2nd arg. Stop using -t, as it is not portable. (base_template_, template_, nx_): Simplify by hardcoding.