Migrate write-good to pre-commit hook

Migrate write-good to pre-commit hook

This final patch removes our dependency on the Coala platform and
migrates the write-good linter over to a pre-commit hook. Also resolves
some write-good issues that were ignored on the Coala platform.

Issue: INFRA-2642
Change-Id: I805f840bd651e76f877a9caccf9c4b80561aa01b
Signed-off-by: Thanh Ha <zxiiro@gmail.com>