Limit all google-cloud api to <2.0.0 as it introduces breaking changes

[potiuk]

Description

Google Cloud APIs introduced breaking changes in 2.0.0 (https://github.com/googleapis/python-container/blob/master/UPGRADING.md) and they already caused a number of changes. We should (for now - before we migrate to 2.0+ ) limit all our google-cloud deps to <2.0.0

Use case / motivation

Make sure that further releases of google cloud APIs are not breaking our builds.