Deployment Procedure Improvements

Remove dependency of python2.
- Disable building of python2 for standard cdb deployment.
- Update supporting scripts for deployment of cdb plugins.
- Update supporting script for generating local password hash during the db creation.
- "soft" deprecate the legacy python web service by removing it from the deployment instructions.
Better documentation in Readme for dependencies, deployment and new documentation for troubleshooting, upgrading, etc.
Update the scripts to use mariadb client binaries instead of mysql.
Resolve db connection string to use the updated mariadb lib in the payara configuration script.

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