Updates armhf, arm64 and x86_64 - queue-worker moves to multi-
arch image. gateway and basic-auth are updated, along with NATS
which has been done in faas-netes for some time now.

Closes: #1539 (partial PR)
Fixes #1537

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>