It is reported that the RHV 4 REST API exposes data used in cloud-init which can include the root password used when creating a system.
*** Bug 1456587 has been marked as a duplicate of this bug. ***
*** Bug 1456588 has been marked as a duplicate of this bug. ***
This issue was addressed in RHEA-2017:1814 with ovirt-engine-4.1.3.2.