Versions now in sync with x86_64:

* `openfaas/gateway:0.8.12-armhf`
* `openfaas/faas-swarm:0.4.1-armhf`
* `openfaas/queue-worker:0.4.9-armhf`

Also moves from functions/ to openfaas/

Signed-off-by: Alex Ellis <alexellis2@gmail.com>