get_instance_type don't handle exception.InstanceTypeNotFound

Obviously not in progress, unassigning so that someone else can have a shot at it.

Fix proposed to branch: master
Review: https://review.openstack.org/3706

Reviewed: https://review.openstack.org/3706
Committed: http://github.com/openstack/nova/commit/07d74aa916ee2798f717ae5d298f8ca51e883770
Submitter: Jenkins
Branch: master

commit 07d74aa916ee2798f717ae5d298f8ca51e883770
Author: Maru Newby <email address hidden>
Date: Thu Feb 2 12:52:10 2012 -0800

    Raise ApiError in response to InstanceTypeNotFound

     * Updates methods in nova.compute.instance_types to catch
       InstanceTypeNotFound exceptions and re-raise them as ApiError.
       - Previously, the methods in instance_types were raising ApiError in
         response to DBError, but the underlying db calls have since been
         updated to detect empty results and throw more specific exceptions.
     * Updates get_instance_type_by_flavor_id to not try to catch DBError,
       as the underlying db call only ever raises FlavorNotFound.
       get_instance_type_by_flavor_id should not raise ApiError, as callers
       expect the FlavorNotFound exception and know how to handle it.
     * Fixes bug 872618

    Change-Id: I8652f04889adb448017afd253ecdcc840fbb660f