enumerating on-host instances via public nova API breaks instance-type-specific metering

[Eoghan Glynn]

Previously the flavor name used in the flavor-specific instance meter
was available from the nova DB instance representation.

Now that we retrieve the on-host instances from the public nova
API as opposed to the DB, we need to retrieve and cache the flavor
name separately.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/15977

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/15977
Committed: http://github.com/openstack/ceilometer/commit/f3641de37fbcb36dddc15d4a918ff771a07b5702
Submitter: Jenkins
Branch: master

commit f3641de37fbcb36dddc15d4a918ff771a07b5702
Author: Eoghan Glynn <email address hidden>
Date: Tue Nov 13 14:01:58 2012 +0000

    Determine flavor type from the public nova API.

    Fixes bug 1078298

    Previously the flavor name used in the flavor-specific instance meter
    was available from the nova DB instance representation.

    Now that we retrieve the on-host instances from the public nova
    API as opposed to the DB, we need to retrieve and cache the flavor
    name separately.

    Change-Id: Ifd15eedd34e4128d5f9bdaa9318049e973dac9ed