Enable docker non-root images + Versions refresh

[nflx]

Change Summary

- Set user in Dockerfiles to seleuser and change workdir from /root to /home/seleuser
- Refresh of versions for ubuntu, python, nodejs, selenium-server, chrome-driver, testng.
- Opened up Pipfile dependencies for future versions and updated lockfile.
- Start using Pipfile.lock versions on docker build, instead of Pipfile.

- The scrapy update also required the patch in the `Add wrapper for parse method that moved` commit.

- Also some minor cosmetic/typo edits.

PR Checklist

• [x] I have read and signed the Contributor License Agreement.

[jasonbosco]

Thank you for this @nflx!