Return 'maintenance' from node-show command

The 'maintenance' field was added to the nodes resource at
cf18e99eebdb107023235ef134640f6f33511acb, this patch makes it to be
shown in the node-show command.

Change-Id: I32cf18e75e54df2443ae921f9c8667ab2d27b086
Fix the test parameter order

On assertEqual, the order of parameters should be (expected, observed).
This patch fixes this  this problem.

Partially Close-bug: #1277104

Change-Id: Ia08e8799b76f543f8e5c3be746aa03e44f419a9e
Merge "Fix the test parameter order"