Merge pull request #35 from axsh/set-baseurl

set baseurl.
Merge pull request #36 from axsh/remove-download-phase-dependency

move download_3rd_party from tests/vdc.sh.d/rhel/3rd-party.sh.
fix expanding variable.
remove unnecessary code.
change curl option.
fix here-document.
move vendor_dir into download_3rd_party.