Test fix. Fix 'stederr' typo in test_create_kickstart

Change-Id: I7eae2d0a11e4bdf78bce013d792ffb8e460bf227
Revert "Correctly display CLI options with '--' in the sphinx docs."

We do want this functionalit for other areas of our docs.
What we need to do is use the :option: role in our Synopsis.

This reverts commit 5ab57291cb7e9e6baaa5eb0a3cc87af16f2fe821.