Add Test runs for Python 3.7 and remove 3.4#5295

Merged

crwilcox merged 3 commits intogoogleapis:masterfrom crwilcox:drop-34-add-37

May 4, 2018

+32-28

Commits on May 3, 2018

Commits on May 4, 2018

Fix googleapis#5292 by draining queue in a way compatible with SimpleQueue and Queue
crwilcox
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