Change the cluster_id sent into Avere Telemetry

[bsniderpa]

The current code sets a very specific custID to be sent into the Avere Telemetry service so that the account can be embedded in it. But the code is combining the resource group and cluster_id in a way that cannot be parsed on the backend.

The issues is on line 182 of src/terraform/providers/terraform-provider-avere/azure.go. Rather than this:
supportNameParts = append(supportNameParts, fmt.Sprintf("%s-%s", resourceGroup, avereVfxt.AvereVfxtName))

it could be like this:
supportNameParts = append(supportNameParts, resourceGroup)
supportNameParts = append(supportNameParts, avereVfxt.AvereVfxtName)

The end result is that the returned string from this function is:
av0x2dCUSTOMER0x2dRESOURCE_GROUP0x2dCLUSTER