The build-info subcommand fetches detailed information on a build given
its UUID. It is possible to also either list the build's artifacts, the
Ansible inventory used for the job, or download the build's console output.
Fix incorrect info fetching.
Change-Id: I1707ab083e4964a8ac410a7421f64acaffe06023
zuul-client can be used to encrypt a secret that can be then used in a
project's jobs.
Also improve the documentation section about using a configuration file.
Change-Id: I10e56883f0b24ac429051af36f9bf58c7594c0ed