Add unittest for job refresh()
Add unittest for job refresh()

Fixes IBMStreams/streamsx.topology#862

ddebrunner/streamsx.topology,ibmkendrick/streamsx.topology,wmarshall484/streamsx.topology,IBMStreams/streamsx.topology,ddebrunner/streamsx.topology,ibmkendrick/streamsx.topology,ibmkendrick/streamsx.topology,wmarshall484/streamsx.topology,ddebrunner/streamsx.topology,wmarshall484/streamsx.topology,ddebrunner/streamsx.topology,IBMStreams/streamsx.topology,ddebrunner/streamsx.topology,wmarshall484/streamsx.topology,ddebrunner/streamsx.topology,IBMStreams/streamsx.topology,wmarshall484/streamsx.topology,ibmkendrick/streamsx.topology,ibmkendrick/streamsx.topology,IBMStreams/streamsx.topology,IBMStreams/streamsx.topology,IBMStreams/streamsx.topology,wmarshall484/streamsx.topology,wmarshall484/streamsx.topology,ibmkendrick/streamsx.topology,wmarshall484/streamsx.topology,ddebrunner/streamsx.topology,IBMStreams/streamsx.topology,ibmkendrick/streamsx.topology