call site 0 for execnet.Channel.__del__
test/rsession/testing/test_hostmanage.py - line 152
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   def test_hrsync_one_host(self):
       h1 = self._gethostinfo()
       finished = []
       rsync = HostRSync(self.source)
->     h1.initgateway()
       rsync.add_target_host(h1)
       self.source.join("hello.py").write("world")
       rsync.send()
       assert self.dest.join("hello.py").check()