examples: Point CNI manifest to master branch

Now that we're reintegrating the v1alpha2 feature branch with master
the postKubeadmCommand that applies CNI needs to point to master.

Signed-off-by: Stephen Augustus <[email protected]>

Author: justaugustus

examples/controlplane/controlplane.yaml

@@ -71,7 +71,7 @@ spec:
   preKubeadmCommands:
   - bash -c /tmp/kubeadm-bootstrap.sh
   postKubeadmCommands:
-  - kubectl --kubeconfig /etc/kubernetes/admin.conf apply -f https://raw.githubusercontent.com/kubernetes-sigs/cluster-api-provider-azure/v1alpha2/examples/addons.yaml
+  - kubectl --kubeconfig /etc/kubernetes/admin.conf apply -f https://raw.githubusercontent.com/kubernetes-sigs/cluster-api-provider-azure/master/examples/addons.yaml
   files:
   - path: /tmp/kubeadm-bootstrap.sh
     owner: "root:root"