Describe the bug
In the TERMINATE task, the terminateReason input parameter only accepts a string. For example:

"terminateReason" :"Oh No! the workflow terminated!"

However, if you attempt to pass in a variable:

"terminateReason" :"${get_error_message.output.result}"

The failure workflow does not receiev the variable value - it receives the string "${get_error_message.output.result}"

Details
Conductor version:
Latest OS build
Persistence implementation: Cassandra, Postgres, MySQL, Dynomite etc
Queue implementation: Postgres, MySQL, Dynoqueues etc
Lock: Redis or Zookeeper?
Workflow definition:

Task definition:

"name": "terminate_fail_error",
"taskReferenceName": "address_error",
"inputParameters": {
"terminationStatus": "FAILED",
"terminationReason": "${get_error_message.output.result}",
"workflowOutput": {
"error_message": "${get_error_message.output}"
}
},
"type": "TERMINATE"
}

workflow JSON has the following entry:

"reasonForIncompletion":"${get_error_message.output.result}"

Expected - the value of the variable:

"reasonForIncompletion":"Address not found."

To Reproduce
Steps to reproduce the behavior:

Expected behavior
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