Use keystone uuid with cloud id
Use keystone uuid with cloud id

ref: https://storyboard.openstack.org/#!/story/135

Use Endpoint ID as a unique identifier for clouds
in refstack test uploads.

Change-Id: I363531ccfbffc5ba76a7d95de6648ff2dd75a95d

openstack/refstack,markvoelker/refstack,openstack/refstack,stackforge/refstack,openstack/refstack,markvoelker/refstack,stackforge/refstack,stackforge/refstack,markvoelker/refstack,markvoelker/refstack,stackforge/refstack,openstack/refstack