Comment 2 for bug 1229912

Reviewed: https://review.openstack.org/48326
Committed: http://github.com/openstack/nova/commit/93695e60ec6136688fe5ca2d6d8494dcfd71eb22
Submitter: Jenkins
Branch: master

commit 93695e60ec6136688fe5ca2d6d8494dcfd71eb22
Author: Gary Kotton <email address hidden>
Date: Wed Sep 25 11:58:17 2013 -0700

    Host aggregate configuration throws exception

    If the virtualization driver did not implement the host
    aggregate support functions (add_to_aggregate,
    remove_from_aggregate and undo_aggregate_operation) then an
    exception is thrown when a host aggregate was created/deleted.
    Configuration of the host aggregates breaks tempest tests when
    the underlying driver does not have these methods implemented.

    The only driver that actually uses this is the Xen driver.
    The solution enables all drivers to support this without
    having to add in specific code. More specifically, the compute
    manager will not raise NotImplementedError.

    Closes-Bug: 1229912
    Closes-Bug: 1229911

    Change-Id: Iee69e45d94047742b6a499a139bac96ad9dd971f