Comment 14 for bug 1235435

Reviewed: https://review.openstack.org/58471
Committed: http://github.com/openstack/nova/commit/ef9aec1cb6ec0d5fae699f9bb1f0d042530de5de
Submitter: Jenkins
Branch: stable/havana

commit ef9aec1cb6ec0d5fae699f9bb1f0d042530de5de
Author: armando-migliaccio <email address hidden>
Date: Mon Nov 18 16:10:48 2013 -0800

    Address infinite loop in nova compute when getting network info

    Move the refresh_cache decorator to get_instance_nw_info.
    In fact, _get_instance_nw_info is called by the decorator
    itself, potentially causing an infinite loop in case nw_info
    is not of the expected value. This is also inline with
    the method's purpose, as stated by the docstring. At the
    same time, ensure that delete_port_for_instance and
    allocate_for_instance continue to refresh the cache by
    using the decorated version.

    Also, add a couple of debug traces that are friendly to
    the developer.

    Partial-bug: 1235435
    Related-bug: 1251792

    Change-Id: I06f8634ea241d05ac8fbcc290adf0cb23829f3e4
    (cherry picked from commit 2e520496c369a8ef646820ec068cc4416ab50eca)