Router: Stat cleanup

Remove old non-required client.timeoutCongestion* stats in OCMOSJ.
Remove RouterThrottle.getInboundRateDelta(), used only for those stats.
Remove transport.sendMessageSize rates longer than 60s, used only for getInboundRateDelta().
Remove transport.receiveMessageSize rates longer than 60s, unused anywhere.
Remove transport.sendProcessingTime rates longer than 60s, unused anywhere.
getInboundRateDelta() was broken anyway as it was looking at send, not receive size.
All of this was untouched since 2004.
9 total rates for required stats removed.