track HTCondor rescheduling iterations and abort if necessary
Depends on Jim's MR going in first - will need reconfiguration based on that before merging.
- track number of scheduling events from HTCondor
- Show this number in the UI
- generalizes updating workflow_metadata via AMQP message from workflow service
- propagates warning/error messages to UI when HTCondor reschedules a running request
Edited by Charlotte Hausman