enable updateStrategy

[mythi]

our daemonsets do not have updateStrategy defined/enabled.

• enable default strategy in plugin daemonSets
• define user configurable updateStrategy settings and add to the operator (to be decided/defined based on the need)

[hj-johannes-lee]

1. DaemonSet.Spec.UpdateStrategy.Type's default value is RollingUpdate.
   Could you explain what you mean that we need to set a default value? Don't all DaemonSets have default value of updateStrategy as RollingUpdate?

2. Does your operand use a rolling deployment strategy?
   from https://sdk.operatorframework.io/docs/overview/operator-capabilities/

Doesn't 'rolling deployment strategy' mean RollingUpdate of UpdateStrategy type?

3. What does the 'bit' have to change? UpdateStrategy.Type can have RollingUpdate or OnDelete. Do you mean about this? Or something else?

[mythi]

1. Could you explain what you mean that we need to set a default value? Don't all DaemonSets have default value of updateStrategy as RollingUpdate?

As far as I understand it, the operator SDK expects the operator to explicitly set the values. Do you read it differently?

3. What does the 'bit' have to change? UpdateStrategy.Type can have RollingUpdate or OnDelete. Do you mean about this? Or something else?

RollingUpdate has parameters that can be configured. They can be useful but perhaps we don't need to add them right now but only focus on making sure we are 'Full lifecycle' compliant. (note: I updated the original description a bit to clarify these)