After changes in the heat-agents [1] the auth calls of the nodes
to heat were failing. The mesos image that was used was missing
chnage [1].
Update to ubuntu-mesos daily builds.
[1] https://review.openstack.org/#/c/397232/1
Closes-Bug: #1662280
Change-Id: I06ab3f7a92f06a7eddf297c5ecd2bf2e35f3728b