http2: fix stream reading resumption
_read
should always resume the underlying code that is attempting to push data to a readable stream. Adjust http2 core code to resume its reading appropriately.
When readable._read() is called, if data is available from the resource, the implementation should begin pushing that data into the read queue using the this.push(dataChunk) method. _read() should continue reading from the resource and pushing data until readable.push() returns false. Only when _read() is called again after it has stopped should it resume pushing additional data onto the queue.
Fixes: https://github.com/nodejs/node/issues/16578 Refs: https://nodejs.org/dist/latest-v8.x/docs/api/stream.html#stream_readable_read_size_1
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
http2, test