Comment 7 for bug 1784874

Reviewed: https://review.opendev.org/676282
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=7302a625ee9af2c9dd88f8630f1e95fc5977a70a
Submitter: Zuul
Branch: stable/queens

commit 7302a625ee9af2c9dd88f8630f1e95fc5977a70a
Author: Dan Smith <email address hidden>
Date: Wed Aug 1 10:16:41 2018 -0700

    Hook resource_tracker to remove stale node information

    When we remove a node from a host due to rebalance or decommission,
    we need to tell the resource tracker so it stops keeping track of
    the details for that node. This adds a hook for doing that and
    calls it from the place in compute manager where we purge the
    record from the database.

    Conflicts:
          nova/compute/manager.py

    NOTE(mriedem): The conflict is due to not having change
    I7e0658e681ead30c241ad39baa0fd4334e5a86a1 in Queens.

    Change-Id: Ie6b6bb2a9e8a4ad33675fccb3827e8197fa16398
    Closes-Bug: #1784874
    (cherry picked from commit 99db9faae5c1e84e5aa8586c32ffcca7a61ae276)