Add JenkinsBuildStep.cancel_step test
Add JenkinsBuildStep.cancel_step test

dropbox/changes,bowlofstew/changes,bowlofstew/changes,dropbox/changes,wfxiang08/changes,wfxiang08/changes,wfxiang08/changes,bowlofstew/changes,bowlofstew/changes,wfxiang08/changes,dropbox/changes,dropbox/changes