tests: remove 063 and 064 from md group

Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
tests: count the number of objects instead of using node info

Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
tests: add support for running check outside tests directory

Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
tests: don't use /tmp for each test

Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
tests: allow running test file directly

Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>