[whatwg/fetch] keepalive: Do we need to restrict the number of requests at a time? (#662)

We are planning to implement and ship the keepalive flag. At [the intent-to-ship thread](https://groups.google.com/a/chromium.org/forum/m/#!topic/blink-dev/8vqcABTnDF4), some people want to  restrict the number of requests at a time, as well as the total number of inflight bytes. Do you think it's reasonable?

@yoavweiss @annevk @igrigorik 

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