subtests..run_twice: Turn the expected fail test result into Good and log related error from stderr.
Signed-off-by: Ouyang Guohua <gouyang@redhat.com>
subtests..workdir: Add workdir test
*  set workdir with exist or nonexist path
*  set workdir with no absolute path or not a dir

Signed-off-by: Ouyang Guohua <gouyang@redhat.com>
Merge branch 'gouyang' of https://github.com/ouyanggh/autotest-docker into docker_0.6.5