Support all taints in network plugins manifests (#6208)

flannel, ovn and multus network plugins did not support all taint keys. This
update changes the tolerations to support them all.

According to the documentation:

```
There are two special cases: An empty key with operator Exists matches all keys,
values and effects which means this will tolerate everything. An empty effect matches
all effects with key key.
```

Usage of the empty `key` and `effect` ensures the network plugin daemonset will
be deployed on every nodes (ex: in case of custom taints, or NoExecute effect)

roles/network_plugin/calico/templates/calico-node.yml.j2

@@ -29,13 +29,7 @@ spec:
       hostNetwork: true
       serviceAccountName: calico-node
       tolerations:
-        - effect: NoExecute
-          operator: Exists
-        - effect: NoSchedule
-          operator: Exists
-        # Mark pod as critical for rescheduling (Will have no effect starting with kubernetes 1.12)
-        - key: CriticalAddonsOnly
-          operator: "Exists"
+      - operator: Exists
       # Minimize downtime during a rolling upgrade or deletion; tell Kubernetes to do a "force
       # deletion": https://kubernetes.io/docs/concepts/workloads/pods/pod/#termination-of-pods.
       terminationGracePeriodSeconds: 0