[quicwg/base-drafts] More generic keep-alive text (#2092)

[Mike Bishop <[e-mail]>]

In #2068, the direction of the discussion is that PING frames are an application-layer concept that won't necessarily be directly under the application-layer's control.  The HTTP draft currently says:
> HTTP clients are expected to use QUIC PING frames to keep connections open while there are responses outstanding for requests or server pushes. If the client is not expecting a response from the server, allowing an idle connection to time out is preferred over expending effort maintaining a connection that might not be needed. A gateway MAY use PING to maintain connections in anticipation of need rather than incur the latency cost of connection establishment to servers. Servers SHOULD NOT use PING frames to keep a connection open.

This should be reworded in terms of requesting the transport stack to keep the connection from idling out, rather than directly discussing PING frames.

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