Server Keep-alive and timeout redesign

[fafhrd91]

Right now we register keep-alive and timeout timers for each connection. And that is very expensive. Also both timers are in seconds. So instead we should use one global timer, seconds base. And manage keep-alive and timeout ourselfs.

It might be useful to use same approach for client as well.

[fafhrd91]

I personally switched all my production systems to SO_KEEPALIVE

[fafhrd91]

basically we should register one timer and manage callbacks in RequestHandlerFactory

[asvetlov]

Pushing timer into RequestHandlerFactory sounds good.
Also I guess rename RequestHandlerFactory to ``RequestManagerfor avoiding clashes withweb-handler` term (with keeping old alias of course).

[fafhrd91]

-1 for RequestManager, misleading name.

[asvetlov]

Fixed by #702

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