tests: move runtest.in away from the top-lever directory Not only this leaves the top-lever directory less cluttered, but helps in keeping the testsuite-related files more "centralized". * runtest.in: Move ... * t/ax/runtest.in: ... here. While at it, add customary '@configure_input@' comment line. * Makefile.am (runtest, EXTRA_DIST): Adjust. Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>