Add flake8 linter to the testing
Add flake8 linter to the testing

http://flake8.readthedocs.io
IBMStreams/streamsx.topology,ddebrunner/streamsx.topology,ddebrunner/streamsx.topology,wmarshall484/streamsx.topology,ddebrunner/streamsx.topology,ddebrunner/streamsx.topology,wmarshall484/streamsx.topology,wmarshall484/streamsx.topology,wmarshall484/streamsx.topology,IBMStreams/streamsx.topology,wmarshall484/streamsx.topology,IBMStreams/streamsx.topology,IBMStreams/streamsx.topology,ddebrunner/streamsx.topology,ddebrunner/streamsx.topology,ddebrunner/streamsx.topology,wmarshall484/streamsx.topology,wmarshall484/streamsx.topology,IBMStreams/streamsx.topology,IBMStreams/streamsx.topology,wmarshall484/streamsx.topology,IBMStreams/streamsx.topology