Update oslo.vmware to version 0.4

The new version will enable integrating oslo.vmware into Nova. It adds
exception types which are needed in Nova and allows completing the
integration with minimal changes and minimal risk of regressions.

Nova blueprint use-oslo-vmware

Change-Id: I0909da73068739f8cf152a67e5807ee8af57ae44
Merge "Update oslo.vmware to version 0.4"