Display help command when unknown command is passed

[scottford-lw]

As a user if I pass an unknown command the CLI should display the help...

Current Behavior

$ lacework foo                                                                                                                                         
ERROR unknown command "foo" for "lacework"

Desired Behavior

$ lacework foo                                                                                                                                         
ERROR unknown command "foo" for "lacework"

The Lacework Command Line Interface is a tool that helps you manage the
Lacework cloud security platform. Use it to manage compliance reports,
external integrations, vulnerability scans, and other operations.

Start by configuring the Lacework CLI with the command:

    $ lacework configure

This will prompt you for your Lacework account and a set of API access keys.

Usage:
  lacework [command]

Available Commands:
  api           helper to call Lacework's RestfulAPI
  compliance    manage compliance reports
  configure     configure the Lacework CLI
  event         inspect Lacework events
  help          Help about any command
  integration   manage external integrations
  version       print the Lacework CLI version
  vulnerability view vulnerability reports and run on-demand scans