Replacing instance id's in in xenapi.vmops and the xen plugin with instance uuids. The only references to instance id's left are calls to the wait_for_task() method. I will address that in another branch. blueprint: internal-uuids (1980)

Replacing instance id's in in xenapi.vmops and the xen plugin with instance uuids. The only references to instance id's left are calls to the wait_for_task() method. I will address that in another branch. blueprint: internal-uuids (1980) · Gerrit Code Review