Test changed with respect to https://www.pivotaltracker.com/s/projects/166935/stories/48602149

Yeti test fixes related to 
Tracker issue https://www.pivotaltracker.com/s/projects/166935/stories/48602149
Related Pull Request https://github.com/cloudfoundry/cloud_contro.....ller_ng/pull/102 
Related Pull Request  https://github.com/cloudfoundry/errors/pull/9