Compute rpc breaks live upgrade from havana to icehouse

[Russell Bryant]

We are attempting to support live upgrades from the Havana to Icehouse release. Some changes to the compute rpc API need to be backported to Havana to make this work.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/havana
Review: https://review.openstack.org/60361

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/havana
Review: https://review.openstack.org/60362

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/60361
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=a7e2a4114a4adbdb0273603515ecfe688e2231dd
Submitter: Jenkins
Branch: stable/havana

commit a7e2a4114a4adbdb0273603515ecfe688e2231dd
Author: Russell Bryant <email address hidden>
Date: Thu Dec 5 14:44:32 2013 -0500

    Allow compute manager to accept 3.0 messages

    We are currently trying to support live upgrades from havana to
    icehouse. This change is required to make that happen. In a live
    upgrade situation, you have icehouse nova infrastructure, with a mix of
    havana and icehouse compute nodes as you roll through and upgrade them.
    While in this situation, the havana compute nodes must be able to accept
    3.0 messages.

    Accepting 3.0 messages is trivial to do and extremely low risk. It does
    not change the behavior of a havana-only deployment at all. The only
    additions is some pass-through code to the current compute manager.
    This code will only get hit during a live upgrade situation.

    Note that there is one other change needed to complete this. With only
    this patch, live upgrades are supported, but any operations that require
    compute nodes to talk to each other will not work. This includes
    resizes and migrates. That would be unfortunate, since live migrations
    are something that people *definitely* want to be able to do during an
    upgrade procedure.

    The additional changes needed to allow resizes and migrates during live
    upgrades are included in another patch.

    Partial-bug: #1258253
    Change-Id: Ia801609b6b3fe88e0d0b16f4c0d37bf25dbfa842

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/60362
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=2c63cae921d024f39f7d14459873d20caa5cf9e0
Submitter: Jenkins
Branch: stable/havana

commit 2c63cae921d024f39f7d14459873d20caa5cf9e0
Author: Russell Bryant <email address hidden>
Date: Thu Dec 5 15:34:58 2013 -0500

    Allow resizes and migrates during live upgrade

    This patch completes the changes needed to havana's compute rpc api to
    allow live upgrades to icehouse. Specifically, these changes are needed
    to allow resizes and migrates to work. Before havana compute nodes get
    put in a mixed environment with icehouse compute nodes, they need to be
    speaking version 3.0 messages.

    Change-Id: If09bd38c9d8c3beb5b95107c497699dec47aa3ef
    Closes-bug: #1258253