Minor fixes for ipminative console support

This patch fixed a few minor problems left over from
https://review.openstack.org/#/c/97331/. It added some missing
exceptions in the doc strings. It also fixed a spelling error
in a testcase etc.

Change-Id: Ic8b1903d7ec429abb72999795631a8cbc7da05f5
Merge "Minor fixes for ipminative console support"