Do not pause transport during set_parser stage

[fafhrd91]

Added allow_pause to flow control related streams, so we can prevent transport pausing during set_parser stage. this should solve #1211

@asvetlov @kxepal i need your review and thoughts

[codecov-io]

Current coverage is 98.92% (diff: 100%)

Merging #1551 into master will increase coverage by <.01%

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  Misses           37         37          
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[fafhrd91]

i think pause_reading should be no-op during transport closing.

[asvetlov]

I think allow_pause should be a private attribute (_allow_pause).
Otherwise we need to document it.

[fafhrd91]

good point, will change

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