Comment 2 for bug 1598843

Reviewed: https://review.openstack.org/337236
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=53ab6068a318079757fa76db37fc9838db2b4f24
Submitter: Jenkins
Branch: master

commit 53ab6068a318079757fa76db37fc9838db2b4f24
Author: Ludovic Beliveau <email address hidden>
Date: Mon Jul 4 09:45:07 2016 -0400

    Don't parse PCI whitelist every time neutron ports are created

    The neutronv2 API is calling the method get_pci_device_devspec()
    everytime a neutron port is created in order to get a PciDeviceSpec for a given
    PCI device. This method creates a new Whitelist (based on the config
    CONF.pci_passthrough_whitelist) and parses it every time it is called. This
    is not a huge overhead but this is obvioulsy not needed and a waste of cycles.

    Since only neutronv2 API uses get_pci_device_devspec(), this commit removes
    the method in favor of using the Whitelist object directly (like it is done
    in the PciDevTracker).

    Change-Id: Idee4e9edecff0672680f323a916201aee8eeeabd
    Closes-Bug: #1598843