Update examples to non-root nginx-hello

[mohamed-gougam]

Proposed changes

This updates all the .yaml files using docker image nginxdemos/hello to use the new non-root image nginxdemos/nginx-hello. Container ports and target ports have been updated to match the image as well. These updates have also been applied for the tests to use the new image.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto master
• I will ensure my PR is targeting the master branch and pulling from my branch from my own fork

[pleshakov]

thanks @mohamed-gougam !

lgtm! including @tellet to review the test parts

[tellet]

Sorry I didn't request it in my first review. Could you please revert the changes related to the test files only? I don't see any need in tests using the new image. Again sorry, I didn't bring that up earlier. Feel free to discuss it one again with the team.

[tellet]

Please revert changes for backend1-svc.yaml too. Apart from this everything is OK.

[tellet]

lgtm