This commit bump up clair to v2.0.4. The current build process is
download the binary from google storage, the update of the binary in
google storage is not reflected in this commit.
This commit fixes a recently discovered issue on Kubernetes #4496
It make necessary to avoid calling `chown` to config files during the
bootstrap of the containers.
The following are done to avoid travis-ci failing due to too much log
size.
1) Update Makefile and scripts to make go build less verbose.
2) Make tdnf less verbose