Optimization of Ceilometer API

[Ladislav Smola]

- at least a simple multithreading that will quicken things up, it's way to slow to wait for every API call to finish

- fix the nits from comments from https://review.openstack.org/#/c/35589/

- do a slight re-factoring of very ugly things (it was written too quickly)

This needs to happen in H3

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/44724

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/44724
Committed: http://github.com/openstack/horizon/commit/b7c4b6b9ce8c509ae83287ae71ab6c1453d3d0fc
Submitter: Jenkins
Branch: master

commit b7c4b6b9ce8c509ae83287ae71ab6c1453d3d0fc
Author: Ladislav Smola <email address hidden>
Date: Mon Sep 2 16:00:17 2013 +0200

    Optimization of ceilometer API

    - optimizing requests for resource by multithreading on resource level
      (each resource is obtaining stats in separate thread)
    - fix last comment addressed in review
      https://review.openstack.org/#/c/35589/
    - fixing typos and misleading comments

    Fixes bug 1218407
    Change-Id: I24826bac7679bd075792691e3ed9a342aa1659fb