cli: inconsistent and incorrect error placement on flag not defined

[jrasell]

Nomad version

Nomad v0.10.2

Operating system and Environment details

Tested on macOS Catalina 10.15.1

Issue

When passing a flag to a Nomad CLI command, which is not defined for use, the output error is inconsistency placed and is also concatenated onto the command usage output. The error will sometimes appear before the command usage, and sometimes after. Both examples are shown below.

Example 1:

$ nomad server members -verbose
flag provided but not defined: -verboseUsage: nomad server members [options]

Example 2 (output shortened):

$ nomad node status -detailed
...
...
  -t
    Format and display node using a Go template.flag provided but not defined: -detailed

Reproduction steps

A couple of commands using incorrect flags:
nomad node status -detailed
nomad server members -verbose

[tgross]

Hi @jrasell! I've marked this as a bug. Thanks!

[github-actions]

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