websocket_test: Remove most manual closes
websocket_test: Remove most manual closes

At one time this was necessary to prevent spurious warnings at
shutdown, but not any more (and I intend to address warnings like this
with a more general solution).

dongpinglai/my_tornado,dongpinglai/my_tornado,dongpinglai/my_tornado,NoyaInRain/tornado,tornadoweb/tornado,allenl203/tornado,allenl203/tornado,bdarnell/tornado,mivade/tornado,bdarnell/tornado,lilydjwg/tornado,dongpinglai/my_tornado,mivade/tornado,mivade/tornado,wujuguang/tornado,NoyaInRain/tornado,wujuguang/tornado,tornadoweb/tornado,bdarnell/tornado,bdarnell/tornado,mivade/tornado,wujuguang/tornado,bdarnell/tornado,tornadoweb/tornado,NoyaInRain/tornado,NoyaInRain/tornado,allenl203/tornado,wujuguang/tornado,allenl203/tornado,dongpinglai/my_tornado,allenl203/tornado,tornadoweb/tornado,mivade/tornado,lilydjwg/tornado,dongpinglai/my_tornado,lilydjwg/tornado,NoyaInRain/tornado,NoyaInRain/tornado,wujuguang/tornado,lilydjwg/tornado