Merge pull request #360 from kevin-bates/fix-leak-kernel-proc

Fix memory leak of kernel Popen object

Author: minrk

jupyter_client/manager.py

@@ -272,6 +272,10 @@ def finish_shutdown(self, waittime=None, pollinterval=0.1):
             if self.is_alive():
                 time.sleep(pollinterval)
             else:
+                # If there's still a proc, wait and clear
+                if self.has_kernel:
+                    self.kernel.wait()
+                    self.kernel = None
                 break
         else:
             # OK, we've waited long enough.