* tools/docker: Upgrade to ubuntu 20.04 , MySQL 8 and python3
* Update tools/docker/README.md
* docker simulator: run 'npm rebuild node-sass' before 'npm install'
Inclusivity changes for CloudStack
- Change default git branch name from 'master' to 'main' (post renaming/changing default git branch to 'main' in git repo)
- Rename some offensive words/terms as appropriate for inclusiveness.
This PR updates the default git branch to 'main', as part of #4887.
Signed-off-by: Suresh Kumar Anaparti <suresh.anaparti@shapeblue.com>
Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
