(#16427) Fix inaccurate usage hint in help
(#16427) Fix inaccurate usage hint in help

Usage in help was provided as "Usage: hiera [options]", which is inaccurate.
This commit uses opts.banner in the option parser to override that, as well
as provide some context about the arguments.

ferventcoder/hiera,johnduarte/hiera,Iristyle/hiera,hlindberg/hiera,Iristyle/hiera,haus/hiera,ripienaar/hiera,justinstoller/hiera,johnduarte/hiera,MikaelSmith/hiera,ripienaar/hiera,justinstoller/hiera,ferventcoder/hiera,ferventcoder/hiera,justinstoller/hiera,johnduarte/hiera,hlindberg/hiera,MikaelSmith/hiera,Iristyle/hiera,MikaelSmith/hiera,hlindberg/hiera