Aaron Lehmann 9903b4cd8e cli: Correct command/image tests for testify
These tests were caught in the crossfire of the transition to testify.
testify has a few subtle differences from the similar custom framework
it replaced:

- Error behaves differently
- Equal takes its arguments in a different order

This PR also takes the opportunity to use a few shorthands from testify,
such as Len, True, and False.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
Upstream-commit: 6f94ab98f5
Component: cli
2017-05-03 18:45:48 -07:00
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