Remove py-six dependecies from gcompute_client. am: bedb9761de am: e8f15dc758

Original change: https://android-review.googlesource.com/c/platform/tools/acloud/+/2019204

Change-Id: Icd5334c395ab87017cdfab750cc387334a1fa381
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>