community/rethinkdb: backport python3 support

See https://github.com/rethinkdb/rethinkdb/issues/6883
7 jobs for !8902 with rethinkdb-py3 in 5 minutes and 18 seconds
latest detached
Status Job ID Name Coverage
  Lint
failed #135917
docker-alpine x86_64 allowed to fail
lint

00:00:22

 
  Build
failed #135922
docker-alpine ci-build aarch64
build-aarch64

00:04:53

passed #135923
docker-alpine ci-build armv7
build-armv7

00:00:32

passed #135921
docker-alpine ci-build ppc64le
build-ppc64le

00:00:47

passed #135920
docker-alpine ci-build s390x
build-s390x

00:00:28

passed #135919
docker-alpine ci-build x86
build-x86

00:00:23

failed #135918
docker-alpine ci-build x86_64
build-x86_64

00:01:53

 
Name Stage Failure
failed
lint Lint
No job log
failed
build-x86_64 Build
No job log
failed
build-aarch64 Build
No job log