Trying to clean a step that doesn't exist shows the wrong error

Metadata

Project: snapcraft (launchpad)
Number: #1604377
Type: issue
State: open
Author: ~elopio
Labels: bitesize
Created: 2016-07-19 12:02:37.870796+00:00
Updated: 2017-03-10 22:49:53.816848+00:00
Closed: —

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Issue body

To reproduce: ⟫ snapcraft clean --step idontexist 'idontexist' is not a valid step for part 'part3' The list of steps is hardcoded. Instead of refering to a specific part, it just should say that the step doesn't exist. Maybe list the valid steps.

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