WIP: Cleaning up the CLI mess stack

[itkovian]

Move code to a new stack such that we can ditch a lot of obsolete code that was once introduced to deal with py 2.[47] shortcomings.

• introduce mixins so derived classes can choose what features to use (timestamps, locks, nagios blah blah, ...)
• allow moving to ConfigArgParse while keeping compatibility with existing code
• fix the parsing of configfiles and spit into multiple arguments for ConfigArgParse
• check if we need the post method
• fix the nagios stats thing so I becomes usable in the new stack

[itkovian]

This is ready for a review, but should not yet be merged.