[kubernetes] Set hostUsers explicitly

The pcm daemons require host privileges. Setting this explicitly
both documentes the incompatibility with user namespaces and
ensures, if the default changes, the daemonset will continue
to function as expected.

Signed-off-by: Pat Riehecky <riehecky@fnal.gov>

Author: jcpunk

pcm-kubernetes.yaml.experimental

@@ -69,6 +69,7 @@ spec:
           periodSeconds: 10
           successThreshold: 1
           timeoutSeconds: 1
+        hostUsers: true
         securityContext:
           privileged: false
           runAsNonRoot: false