VMware: update to latest cirros image

The default image used is cirros 0.3.0, which is out-dated and
does not support cloud-init for config drive.  By upgrading to
0.3.2, we gain config drive support testing in our tempest runs.

Change-Id: Ibe7f70f1fb457d210b891b19ba3b5be94b2343f0
Merge "VMware: update to latest cirros image"