Cleanup TPI cli tool

[hgadgil]

TPI cli needs improvement w.r.t options as they are organized. Currently it is a tad bit confusing where the TPI cli when executed with sub-options and flags produces an output that is unclear.

For instance:
tpi firmware -v
shows the TPI cli's version rather than the firmware.

Secondly, the options could themselves be better organized (e.g. borrowing from kubectl) so that the usage is intuitive and output is very clear
CMD <ACTION> <RESOURCE> <FLAGS>

e.g.:

tpi get firmware version
tpi set node 1 --power on

[gjrtimmer]

@hgadgil Could you provide a PR?

[hgadgil]

I was not actively working on this - I was hoping someone working on this would pick this up. This could result in good chunk of refactoring possibly.