Replace coala with pre-commit

Replace coala with pre-commit

Coala hasn't had a release in years and pre-commit runs a bit faster
and has less requirements (no nodejs).

Additionally pre-commit doesn't just complain about the issues, it
actively resolves the issues for you. Locally a developer can
install the hooks with `pre-commit install` and onwards pre-commit
will automatically run against only the changed files every time
the developer types `git commit`.

A manual run against all files in the repo can be triggered by
running `pre-commit run --all-files`.

Change-Id: I4a065212158665b34da4f269baaa38e3fd4ddb84
Signed-off-by: Thanh Ha <zxiiro@gmail.com>