Add option to autorelease-carbon to provide test ExcludesFile

As we identify sporadic failures, we want to be able to ignore them from autorelease if possible until they are fixed so we unblock progress. The way to do this is documented here:
https://maven.apache.org/surefire/maven-surefire-plugin/test-mojo.html#excludesFile

See this thread for even more info:
https://lists.opendaylight.org/pipermail/release/2017-April/010347.html