Add ability to disable LastAppliedReplicas on Deployment

[Burr]

Currently when a Deployment is created, the LastAppliedReplicas annotation is added; once present, Smith will no longer change the replicas for a Deployment unless the field is updated in the Bundle.

In some cases, we may want Smith to continue managing the replicas field on a Deployment. To support this use case, we should add the ability to disable the LastAppliedReplicas.