[v9.x backport] Various http2 changes#19579

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targos wants to merge 6 commits intonodejs:v9.x-stagingfrom

targos:v9.x-http2

Commits on Mar 24, 2018

test: http2 errors on req.close()

trivikr
authored and
targos
committed
test: add more asserts to `test-internal-errors`

refack
authored and
targos
committed
test: fix common.expectsError

refack
authored and
targos
committed
test: fix wrong error classes passed in as type

BridgeAR
authored and
targos
committed
test: http2 stream.respond() error checks

trivikr
authored and
targos
committed
http2: refer to stream errors by name

addaleax
authored and
targos
committed