gevent / gevent / 3531

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Fix Popen.communicate() to raise exceptions from reading the streams.

And a general clean up of how the streams are read, ensuring we just have one greenlet. This avoids the 'reentrant call' errors that could prevent closing the streams on time.

Fixes #1510

114 of 114 new or added lines in 6 files covered. (100.0%)

21632 of 24871 relevant lines covered (86.98%)

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