Fix remote shell NameError on exception

cloudcontrol/node/host/__init__.py

@@ -106,7 +106,7 @@ class RemoteShell(object):
         except OSError:
             logger.exception('Error while executing remote shell')
             # close opened fds
-            self.close_cb()
+            self.close()
             raise
         self.child_watcher = conn.loop.child(self.process.pid, False,
                                              self.child_cb)