Moves setup files into embedded package.

internal/setup/cluster-services/metallb/kustomize.template/configuration/kustomization.yaml

@@ -0,0 +1,3 @@
+namespace: metallb-system
+resources:
+  - pool.yaml

internal/setup/cluster-services/metallb/kustomize.template/configuration/pool.yaml

@@ -0,0 +1,19 @@
+---
+apiVersion: metallb.io/v1beta1
+kind: IPAddressPool
+metadata:
+  name: first-pool
+  namespace: metallb-system
+spec:
+  addresses:
+  - {{ .cluster.ipAddressPool }}
+
+---
+apiVersion: metallb.io/v1beta1
+kind: L2Advertisement
+metadata:
+  name: l2-advertisement
+  namespace: metallb-system
+spec:
+  ipAddressPools:
+  - first-pool