tools/docker: Upgrade to ubuntu 20.04 , MySQL 8 and python3

[weizhouapache]

Description

This PR upgrades cloudstack simulator to Ubuntu 20.04, MySQL 8 and python3, launches cloudstack UI at port 5050.

README.md is updated accordingly.

fixes #4891

How to test it

cd tools/docker 
docker build -f Dockerfile -t cloudstack/simulator ../..
docker run --name simulator -p 8080:5050 -d cloudstack/simulator
docker exec -it simulator python /root/tools/marvin/marvin/deployDataCenter.py -i /root/setup/dev/advanced.cfg

# Open your browser at http://localhost:8080/

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

[rohityadavcloud]

Didn't test it manually, I think we can merge if Wei can confirm how/if he has tested this.

[Pearl1594]

Tested it locally - works fine - http://localhost:8080 opens the onboarding UI page (haven't setup the zone)

[rohityadavcloud]

cc As Wei advised @tampler maybe try these changes (git cherry-pick) in your private branch and see if it fixes your issue.

[synergiator]

as of today, I was able to build and run a container with the 4.17 snashot (latest master as of Mai 16th 2022) and logon to UI. Would be great to see fresh images on Docker Hub!

[synergiator]

build from tag 4.16.1 advanced configuration does not work

docker exec -it simulator python /root/tools/marvin/marvin/deployDataCenter.py -i /root/setup/dev/advanced.cfg
=== TestClient Creation Failed===

``

[weizhouapache]

@synergiator
I will check it

[weizhouapache]

@synergiator
I have built a docker image from cloudstack 4.16.1.0 and uploaded to my owner docker hub:
https://hub.docker.com/repository/docker/ustcweizhou/cloudstack-simulator

it works well in my testing

root@689d4fe9dabc:~# python /root/tools/marvin/marvin/deployDataCenter.py -i /root/setup/dev/advanced.cfg

==== Log Folder Path: /tmp/MarvinLogs/DeployDataCenter__May_17_2022_11_49_11_KB6AX4 All logs will be available here ====

==== Deploy DC Started ====

=== Data Center Settings are dumped to /tmp/MarvinLogs/DeployDataCenter__May_17_2022_11_49_11_KB6AX4/dc_entries.obj===

====Deploy DC Successful=====
root@689d4fe9dabc:~# 

Please notice you should create the zone only when management server is running.

[synergiator]

thanks @weizhouapache - it works indeed with 4.16.1.0, obviously I did not verified final server start logs. Now it's time for the Docker Hub release :-)