Enable linting for the repo

This change creates necessary configuration for running lint
against the changes sent to this repository. Outcomes of all
checks are currently disabled and they will be enabled once
the current issues are fixed.

Only yamllint is enabled as ansible-lint and shellcheck are
not applicable to the repo.

Change-Id: I2303aaaedff1d86a67c16468505824a2681113f5
5 files changed