Akihiro Motoki 06f7b483a8 Remove six usage
This repo does not support Python 2 anymore, so we don't need
six for compatibility between Python2 and 3, convert six usage to Python
3 code.

Change-Id: I3edab6e67ac79d14fe9d38f6f75abfd50030fa1e
Needed-By: https://review.opendev.org/701743
2020-01-12 02:42:29 +09:00
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