[WIP] Switch python tests to testgres#16
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I have added TCP-DS in a separate PR #17, since it is difficult to do two huge things at once (migrating to testgres and adding TCP-DS). Although I still think that tesgress is a powerful Postgres testing framework and hope that migration to it will help us to unify our testing routines across different projects. So I keep this PR and mark it as work-in-progress for now.