PciDeviceStats not compared properly

[Attila Fazekas]

https://github.com/openstack/nova/blob/5b77c108f14f2bcd42fecfcd060331e57a2e07dd/nova/compute/resource_tracker.py#L554 is always true, since the nova.pci.stats.PciDeviceStats is different object even if it has an equivalent content.

Please compare the resources properly and send updated resource info ONLY when it is REALLY needed.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/168317

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/168317
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=0efc217ba00f49e4d51bafed54d483007a4d51c5
Submitter: Jenkins
Branch: master

commit 0efc217ba00f49e4d51bafed54d483007a4d51c5
Author: Moshe Levi <email address hidden>
Date: Fri Mar 27 14:19:24 2015 +0300

    Add equality operators to PciDeviceStats and PciDevice objects

    resources['pci_device_pools'] value is now PciDeviceStats object
    therefore when comparing this resource it is need equality operators
    to compare the inner content.
    the PciDeviceStats itself contain PciDevice objects, therefore
    equality operators need here as well.

    Closes-Bug: #1436986

    Change-Id: Ib6f051dd65ad6960bba18052b49a9a678d3b3ae0