Updated openstack/openstack
Project: openstack/nova  e0a4054ea20986ea4feb75b1728b8e43a325e4b7
null
xenapi: workaround for failing vbd detach

Sometimes xapi returns with an internal error during unplug_vbd. This
patch adds a workaround for XenServer 6.2 by inspecting the error
message, and retry the unplug.

In addition, this also ensures that sleep is no longer called after the
last retry before raising an exception.

Fixes bug 1217972
Change-Id: I7b86325714e38b00a2f51bbf083b5532a6c51fa9