Move .set_cli and .load to the project() object.

The API changes from config.project().from_options().load() to
config.project().load(); the intermediate project() object now
serves as the config handle.  As a 'side-effect', config vars
can be named 'set_cli' and 'load' now.

Change-Id: Ic676f3cb3dabd03a67bc523e1de9a1e1d60a9431
Merge "Move .set_cli and .load to the project() object."