Disable unused Python 2 variant. am: 5cd0b3ded4 am: f1b3028b2f am: 70a3fb1cd3 am: 0a2be97d7b

Original change: https://android-review.googlesource.com/c/platform/external/python/oauth2client/+/2221452

Change-Id: I62ef4c71c9e78e95086099fc82a6db16df6c89b0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>