default ncpus to vcpu_count

[themorey]

this supports scheduling to all vcpus on HT VMs and does not impact non-HT VMs

[themorey]

As a data point, the Gridengine project autoscale.json defaults to vcpu

[themorey]

another data point...the documenation says the default is vcpu_count
https://docs.microsoft.com/en-us/azure/cyclecloud/openpbs?view=cyclecloud-8#defining-openpbs-resources

The default resources defined with the cluster template we ship with are

{"default_resources": [
   {
      "select": {},
      "name": "ncpus",
      "value": "node.vcpu_count"
   },