This patch adds a script for validating YAML files, and replaces the
existing JSON checks with one largely identical to the YAML check.
This also provides a script that can be installed as a pre-commit hook
that will perform this checks when you commit changes. You can install
the hook by running tools/pre-commit-hook --install.
Change-Id: Ib4742a9db062362cfa61d669c691151bc1ca376c