Update python3 version to 3.8

[ferbncode]

Update python3 version to python3.8. Updated the version for werkzeug and requests modules too as some modules were marked deprecated in 0.16.0 and we should start fixing them too.

[paramsingh]

lgtm but I'm wondering if we should hold off on merging this until we upgrade LB, CB and MsB to 3.8 too, thoughts?

[ferbncode]

Agreed, brainzutils-python already uses werkzeug==0.15.5, which fixes an issue with python 3.8 - pallets/werkzeug#1551 - CB currently uses old version of brainzutils-python. So, we can definitely wait to merge this after migrating other projects.

I expect updating the version here to not hurt (as it is not a major version change and we'd have to upgrade the brainzutils-python version in project anyways), but it would be nice to migrate at least one project before we release these changes.

[paramsingh]

Sounds good.

[alastair]

lgtm but I'm wondering if we should hold off on merging this until we upgrade LB, CB and MsB to 3.8 too, thoughts?

yes, for sure. This also has to cover the python baseimages, and as we did when we did the last upgrade here, we should test each app using the PR branch before merging it for good.
For the baseimage upgrades, we need to make sure that the consul setup is working properly, I remember that we had some issues with this last time due to startup scripts in different apps expecting different consul configuration.

[alastair]

This is a small change and has conflicts. I'm going to close it in favour of #45, sorry for the 1 year delay!