Change CI Ocata image url to match internal mirror
Change CI Ocata image url to match internal mirror

The internal pipeline image mirror has a slightly different
folder structure that doesn't include the /current-tripleo/ folder
anyways this was causing Ocata pipeline builds to fail.

Change-Id: I688218dda2c32222df3752bceb771427c2ba9425

jkilpatr/browbeat,jkilpatr/browbeat