Devops 650 allow multiple updates of same resource

[jchanam]

We have changed the way updates are done.

Until now, when the Redis statefulset was updated, it waited until the rolling update to be finished. The same happened with Sentinel with its deployment.

He have multiple premises in mind:

• Kubernetes deployments and statefulsets are trustworthly.
• Multiple updates on the same resource on k8s can be made.
• We don't want to update sentinel and redis at the same time to avoid failures.

So, from now, the updates don't wait to themselves to be finished. In stead, they check that the other resource is ready and there's no an update being done (to prevent simultaneous redis and sentinel updates).