[RFE] control maxUnavailable for Openshift daemonsets

1. Proposed title of this feature request
Have control over the settings of maxUnavailable
2. What is the nature and description of the request?
This is a catch all rfe to leverage upon work already done for setting maxUanavailable to an explicit value of 10%
  - ds/tuned https://issues.redhat.com/browse/OCPBUGSM-15168 
  - ds/node-exporter  https://issues.redhat.com/browse/OCPBUGSM-15166
  - ds/machine-config-deamon https://issues.redhat.com/browse/OCPBUGSM-15170
   Having the discretion to set this to a higher value 
3. Why does the customer need this? (List the business requirements here)
 For some of his clusters customer prefers having the upgrade during downtime due to application / client limitations failing during an upgrade.
Hence target is to minimize cluster upgrade time as much as possible - as availability is not a concern during the upgrade
4. List any affected packages or components.
   - ds/node tuning operator
   - ds/node exporter
   - ds/machine-config-deamon
   - Any other component like OVS/sdn which