Fixing linting issues

Author: dwang3851

worker.py

@@ -376,4 +376,4 @@ def run(self):
             if self.preVM and not vm:
                 vm = self.job.vm = self.preVM
             if vm:
-                self.detachVM(return_vm=False, replace_vm=True)
+                self.detachVM(return_vm=False, replace_vm=True)