1. Use tox to make packages.
2. Change the way to install nodejs and yarn with nvm.
3. Update the skyline-console submodule
Change-Id: I363ec0dcda428701be2260893ebe97aa3dd77b5f
The default pre.yaml will revoke the sudo. So we install the extra tools
before we revoke the sudo.
Change-Id: Ie4ae0dc8ee90e6ea79f2b463988c32aa4ddaadba