Inconsistencies in duffle <action> outputs

[vdice]

Comparing the outputs of each duffle <action> cli invocation (intentionally withholding required args/params), we see the following (invoking duffle install, duffle upgrade, duffle status and duffle uninstall in that order):

 $ for action in install upgrade status uninstall; do duffle $action ; echo $?; done
Error: this command requires at least one argument: NAME (name for the installation). It also requires a BUNDLE (CNAB bundle name) or file (using -f)
Valid inputs:
	$ duffle install NAME BUNDLE
	$ duffle install NAME -f path-to-bundle.json
1
Error: This command requires at least 1 argument: the name of the installation to upgrade
1
Error: required arg is NAME (installation name
1
1

Definitely good to see all exiting non-zero properly, but a few issues/requests arise:

1. As all invocations will minimally require an installation name, would it be possible to share the same output? And/or, better aligning of the messaging around this particular missing, required argument would be good.

2. We see duffle uninstall outputs no messaging whatsoever. This should be addressed, ideally with same aligned messaging as mentioned in 1.

[radu-matei]

This is going to be tricky going forward - starting in #630, we will have stateless actions - actions that do not require an installation name - meaning the argument number / types will diverge even more - feel free to chime in #629.