call site 3 for execnet.PopenGateway.exit
test/rsession/testing/test_hostmanage.py - line 85
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   def test_initgateway_localhost_relpath(self):
       host = HostInfo("localhost:somedir")
       host.initgateway()
       assert host.gw
       try:
           homedir = py.path.local._gethomedir() 
           expected = homedir.join("somedir")
           assert host.gw_remotepath == str(expected)
       finally:
->         host.gw.exit()