Fixed invalid session cleanup timeout.
Fixed invalid session cleanup timeout.

mrjoes/sockjs-tornado,pjknkda/sockjs-tornado,MrJoes/sockjs-tornado,DexterInd/sockjs-tornado,DexterInd/sockjs-tornado,ImaginationForPeople/sockjs-tornado,ImaginationForPeople/sockjs-tornado,codepython/sockjs-tornado,codepython/sockjs-tornado,codepython/sockjs-tornado,barseghyanartur/sockjs-tornado,ImaginationForPeople/sockjs-tornado,pjknkda/sockjs-tornado,DexterInd/sockjs-tornado,pjknkda/sockjs-tornado