OWLS-72816 Generate event and status when operator can't scale cluster past maximum

[alai8]

When a replicas value is below the configured min cluster size, or above the configured max cluster size, generate events such as:

Events:

5s          Warning   DomainValidationError       domain/domain1   Validation error in domain resource domain1: Replica request of 2,020 exceeds the maximum dynamic server count of 2 configured for cluster cluster-1

9s          Warning   DomainValidationError       domain/domain1   Validation error in domain resource domain1: Replica request of 0 less than the minimum dynamic server count of 1 configured for cluster cluster-1

Also update status.message of the domain resource to:

"Replica request of 2,020 exceeds the maximum dynamic server count of 2 configured for cluster cluster-1"

"Replica request of 0 less than the minimum dynamic server count of 1 configured for cluster cluster-1"

Also include in the PR a fix for a bug that was found in validation of serverName of specified in managedServer, in that a validation warning message such as the following is added even though the server name exists in a dynamic cluster:

"Managed Server 'managed-server1' specified in the domain resource does not exist in the WebLogic domain home configuration."

https://build.weblogick8s.org:8443/job/weblogic-kubernetes-operator-kind-new/3334/

[doxiao]

LGTM. Just one minor comment.

[doxiao]

change InvalidReplicasValue to DomainValidationError?

[alai8]

thanks. updated with example of DomainValidationError.

[rjeberhard]

@tbarnes-us, are your concerns addressed?

[tbarnes-us]

General comment: @alai8 Please file a JIRA for an 'unhappy path' IT test to test this change across a couple of simple representative failure cases. I think @sankarpn is already testing other unhappy paths, so loop him in.