All services like docker and k8s.io use their own namespaces
for core services, this change moves openfaas services into
the openfaas namespace instead of the default one.
The main change is that logs will look like:
journalctl -t openfaas:gateway
Instead of "default:gateway"
Function logs will remain unaffected and scheduled in the
openfaas-fn namespace.
Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>
