Comment 6 for bug 1522232

Reviewed: https://review.openstack.org/272414
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=b36da5dd037219ceb71c4c6ea6925d2eba6cd59b
Submitter: Jenkins
Branch: master

commit b36da5dd037219ceb71c4c6ea6925d2eba6cd59b
Author: Feng Xi Yan <email address hidden>
Date: Tue Jan 26 15:13:36 2016 +0800

    <VMWare> Allocate free bus for new SCSI controller

    There are at most 16 virtual disks that can be attached onto a SCSI
    controller, while if the limitation is reached, error occurs
    with message "VMwareDriverException: Invalid configuration for
    device '0'".

    The reason is that when the controller's quota is used up, a new
    controller will be created automatically, but the newly-created
    one will try to use bus number 0, which is already used my existing
    controller.

    This change will allocate a new free bus number for the newly-created
    controller.

    Co-Authored-By: Qiaowei Ren <email address hidden>

    Closes bug: #1522232

    Change-Id: I2ced1358e682cda979d1d5bddb6359253699280b