Datastore create: ensure targetHypervisorClusterId exists

[stuart-mclaren-hpe]

A change in server behaviour means that a POST request to create a datastore such as:

{
  "name": "mclaren-dsx24",
  "sizeInBytes": 17179869184,
  "storageSystemId": "f9689284-0bbd-5bf1-981f-b9799bbc106c",
  "targetHypervisorClusterId": "",
  "datastoreType": "VMFS"
}

will return a 400 error such as

{
  "debugId": "df4c4f566584ca1fc4511d77fe668f0d",
  "errorCode": "HPE_GL_VIRTUALIZATION_BAD_REQUEST",
  "httpStatusCode": 400,
  "message": "input attributes name, type, sizeInBytes, storageSystemID and targetHypervisorClusterID are mandatory parameters. Error: Key: 'CreateDatastoreVirtRequest.TargetHypervisorClusterID' Error:Field validation for 'TargetHypervisorClusterID' failed on the 'required' tag"
}

To avoid this error, rather than have the system set a default value for targetHypervisorClusterId, we set it expliclity like this:

{
  "name": "mclaren-dsx24",
  "sizeInBytes": 17179869184,
  "storageSystemId": "f9689284-0bbd-5bf1-981f-b9799bbc106c",
  "targetHypervisorClusterId": "ef277a80-6891-534a-9a36-5c7fa67d582a",
  "datastoreType": "VMFS"
}

This requires an additional REST API call to determine the cluster id value based on the name.