Investigate mariadb-tools for merging / cherry-picking enhancements

[gordan-bobic]

Forked from the only known remaining repository to here:
https://github.com/shatteredsilicon/mariadb-tools

Establish:

1. Which percona-toolkit version each of the tools was forked from
2. Establish what additional changes/features were implemented on top of percona-toolkit versions, and produce a list of features/fixes for discussion about whether we want to include them in our fork.

Note: it is possible that some of the tools are original, rather than renamed and modified from percona-toolkit tools. Similarly for such original tools, we need to discuss whether we want to include them in silicon-toolkit.