ansible: fix configuration disk description
ansible: fix configuration disk description

The engine identifies the configuration disk
just by its description or its uuid.
Current ansible 2.4 unfortunately doesn't handle
the desscription field so we have to directly
interact with REST API as a workaround.
Inject also the uuid in engine DB.

Bug-Url: https://bugzilla.redhat.com/1517810

Change-Id: Icdfbd702d683ce075ebfe24053ef995ae062030e
Signed-off-by: Simone Tiraboschi <cb03129c66ba4da7ba7044049d0f43907bf857bb@redhat.com>

oVirt/ovirt-hosted-engine-setup,oVirt/ovirt-hosted-engine-setup