message: Revise ref topology
  Add queue size, stack size, and priority to cmdDisp instance
diff: module Ref {
  - instance cmdDisp: Svc.CommandDispatcher base id 121
  + instance cmdDisp: Svc.CommandDispatcher base id 121 \
  + queue size 20 stack size 10 * 1024 priority 101
  instance chanTlm: Svc.TlmChan base id 61
  