VMware: exception when deleting a VM that has no datastore

[Gary Kotton]

The following appears in the log files when this happens:

[req-83b880af-7ed2-417f-8d91-ae9b7d624be1 FixedIPsTestJson-1652350262 FixedIPsTestJson-1562534047] In vmwareapi:vmops:destroy, got this exception while deleting the VM contents from the disk: local variable 'datastore_name' referenced before assignment

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/71301

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/71301
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=acf9fddcf3129ffab9e01aeb1e9991830013bfbd
Submitter: Jenkins
Branch: master

commit acf9fddcf3129ffab9e01aeb1e9991830013bfbd
Author: Gary Kotton <email address hidden>
Date: Wed Feb 5 08:00:18 2014 -0800

    VMware: ensure that datastore name exists prior to deleting disk

    Treats cases when there is no datastore defined on the VM. This
    can result from a exception in the spawn method prior to setting
    the datastore for the VM.

    Closes-bug: #1276644

    Change-Id: I808e1cdaace344da021853d0ef224cadee5a8e05