[dev] Reminder about submitting code

All - I am seeing a large number of PR's lately that have some completely inconsistent tab/spacing that just look awful. I would highly recommend everyone install the git `clang-format`. This is documented in our workflow: http://docs.frrouting.org/projects/dev-guide/en/latest/workflow.html#code-fo... Please take a second and set yourself up and take advantage of this fine tool. thanks! donald