[BEAM-9510] Fixing version incompatibilities in base_image_requirements.txt

[davidyan74]

Tried this out and it doesn't have any compatibility error messages any more for python3.

R: @tvalentyn

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Post-Commit Tests Status (on master branch)

Lang	SDK	Apex	Dataflow	Flink	Gearpump	Samza	Spark
Go		---	---		---	---
Java
Python		---			---	---
XLang	---	---	---		---	---

Pre-Commit Tests Status (on master branch)

---	Java	Python	Go	Website
Non-portable
Portable	---		---	---

See .test-infra/jenkins/README for trigger phrase, status and link of all Jenkins jobs.

[davidyan74]

R: @aaltay

[tvalentyn]

Run Dataflow Python ValidatesContainer

[tvalentyn]

Run Python Dataflow ValidatesContainer

[aaltay]

Nice, thank you!

[tvalentyn]

Thanks, @davidyan74! Added a small change to reflect that typing should only be installed on Python 2 (this was recently changed in Beam master).

[tvalentyn]

Run Python Dataflow ValidatesContainer

[tvalentyn]

LGTM
A few things out of scope of this PR:

1. This PR fixes the incompatibility in dependencies, but the list of dependencies is in base_image_requirements.txt is still not exhaustive. So, container builds may not be repeatable over time, and there is a risk that we will introduce incompatible dependencies down the road and won't notice it.
2. We can consider switching the base image to python:slim-stretch instead of python:stretch to reduce the size of the images: https://github.com/apache/beam/blob/master/sdks/python/container/Dockerfile#L20
   cc: @Hannah-Jiang

[tvalentyn]

While Jenkins does not show test result on the PR, the tests are actually running: https://builds.apache.org/job/beam_PostCommit_Py_ValCont_PR/122/.
Let's check the console logs that there are no conflicts before the merge.

[tvalentyn]

Run Python Dataflow ValidatesContainer

[tvalentyn]

Test logs LGTM: https://builds.apache.org/job/beam_PostCommit_Py_ValCont_PR/123/timestamps/?time=HH:mm:ss&timeZone=GMT-7&appendLog&locale=en_US

FYI @amaliujia - containers on the latest release branch may also be broken and require changes to fix incompatible dependencies. Do you think you can check this? Otherwise it may come up during release validation. You can make a similar change to the release branch, then have a look at the logs of ValidatesContainer suite against the release branch, and make sure pip does not complain about incompatible dependencies.

@Hannah-Jiang and @davidyan74 also can help if you have questions.

[davidyan74]

Thanks @tvalentyn. We might want to add pip check after pip install in our tests to make sure there is no incompatibility going forward. pip install does not return an error exit code for broken dependencies for historical reasons.

[davidyan74]

Fiiled BEAM-9530.