Use the openfaas namespace for core services

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>

pkg/constants.go

@@ -3,4 +3,11 @@ package pkg
 const (
 	// FunctionNamespace is the default containerd namespace functions are created
 	FunctionNamespace = "openfaas-fn"
+
+	// faasdNamespace is the containerd namespace services are created
+	faasdNamespace = "openfaas"
+
+	faasServicesPullAlways = false
+
+	defaultSnapshotter = "overlayfs"
 )