Remove py-six dependencies from utils. am: b54c5e6a60 am: e5176eb297 am: f5d75f9e4b

Original change: https://android-review.googlesource.com/c/platform/tools/acloud/+/2019233

Change-Id: I473c6400bf614a974467b8620d715208ece05dfa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>