Update oslo.vmware to be >= 0.3

This update contains support for storage policy based management
and a couple of bug fixes.

This update is required to support storage policies in Glance:
see blueprint: storage-policies-vmware-store

Change-Id: Icf6eae58bc2add866dbdca61c30600dfe8c8ba96
Merge "Update oslo.vmware to be >= 0.3"