Comment 8 for bug 1505124

Reviewed: https://review.fuel-infra.org/12734
Submitter: Vitaly Sedelnik <email address hidden>
Branch: openstack-ci/fuel-7.0/2015.1.0

Commit: 6e97f7b778dd234e112682a874332c11456b5bf1
Author: Mark Goddard <email address hidden>
Date: Thu Feb 4 14:56:08 2016

Refresh instance info cache within lock

Fix interface attachment bug where multiple concurrent attachment
requests can cause corruption of the nova instance info cache. This
change refreshes the info cache object from the database whilst
holding the refresh-cache lock, ensuring that changes are
synchronised.

Change-Id: I6ea2eda8a61f418b0c32f13a7ed6904352712857
Closes-Bug: #1541838
Related-Bug: #1505124