contrib: add control-plane toleration for open-vm-tools

From Kubernetes v1.20.0 Release notes:
The label applied to control-plane nodes "node-role.kubernetes.io/master"
is now deprecated and will be removed in a future release after a GA
deprecation period.

Introduce a new label "node-role.kubernetes.io/control-plane" that will
be applied in parallel to "node-role.kubernetes.io/master" until the
removal of the "node-role.kubernetes.io/master" label.

xref: https://kubernetes.io/docs/setup/release/notes/#no-really-you-must-read-this-before-you-upgrade

Signed-off-by: Alex Szakaly <alex.szakaly@gmail.com>

Author: alex1989hu

contrib/open-vm-tools/open-vm-tools-ds.yaml

@@ -25,6 +25,10 @@ spec:
       - key: node-role.kubernetes.io/master
         operator: Exists
         effect: NoSchedule
+      - key: node-role.kubernetes.io/control-plane
+      - key: node-role.kubernetes.io/control-plane
+        operator: Exists
+        effect: NoSchedule
       containers:
       - image: linuxkit/open-vm-tools:v0.8
         name: open-vm-tools