fix set_branch

Author: LD250

jenkins-cli/jenkins_cli.py

@@ -122,6 +122,7 @@ def set_branch(self, args):
             if revision is not None:
                 revision.text = args.branch_name
                 new_xml = ElementTree.tostring(root)
+                self.jenkins.reconfig_job(job_name, new_xml)
                 print 'Done'
         if new_xml is None:
             print "Can not set revision info"