Also update gometalinter to use the official version. The update
found some new gosimple errors, which are fixed.
Also update the filewatcher script for the latest version of filewatcher.
Signed-off-by: Daniel Nephin <dnephin@docker.com>
This make updating vndr a deliberate action, and
prevents updates to vndr from making the vendor
validation fail in CI.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>