Order imports in alphabetical order (1/9)

This patch is one in a series to re-enable H306 style check rule
(imports are in alphabetical order). It touches contrib resources.

Change-Id: Icfe39ee206a70a25e78027a5d097d1208f8750cf
Implements: blueprint reduce-flake8-ignored-rules (partial)
Merge "Order imports in alphabetical order (1/9)"