Passing unknown command to lerna should print to stderr and have a non-zero exit code

[martijnthe]

Expected Behavior

$ yarn lerna bogus_cmd
yarn run v1.3.2
[REDACTED]/node_modules/.bin/lerna bogus_cmd
ERROR: Known command 'bogus_cmd' (or something along these lines)
✨  Done in 0.41s.
$ echo $?
1

Current Behavior

$ yarn lerna bogus_cmd
yarn run v1.3.2
[REDACTED]/node_modules/.bin/lerna bogus_cmd
✨  Done in 0.41s.
$ echo $?
0

Possible Solution

Seems obvious?

Steps to Reproduce (for bugs)

See above.

lerna.json

{
  "lerna": "2.4.0",
  "version": "0.7.0",
  "commands": {
  },
  "npmClient": "yarn",
  "useWorkspaces": true
}

lerna-debug.log

<!-- If you have a `lerna-debug.log` available, please paste it here -->
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Context

Your Environment

Executable	Version
lerna --version	2.4.0
yarn --version	1.3.2
node --version	v8.1.3

OS	Version
macOS Sierra	10.12.6

[evocateur]

Duplicate of #1098

[lock]

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