do not crash when process is already killed in the mean time

base.py

@@ -237,7 +237,10 @@ class ServiceManager:
             for p in procs.get(ins, {}).get(service, []):
                 print_wait = True
                 for action in ('terminate', 'kill'):
-                    getattr(p, action)()  # p.terminate or p.kill
+                    try:
+                        getattr(p, action)()  # p.terminate or p.kill
+                    except psutil.NoSuchProcess:
+                        continue  # already killed
                     for i in range(10):  # total 0.1 * 10 * 9 / 2 = 4.5 sec
                         try:
                             p.wait(0.1 * i)