sample return values needed in groupby statistics API v2 documentation

[Terri Yu]

There aren't any sample return values for the groupby statistics user examples in the API v2 documentation, as noted in the code review comments

https://review.openstack.org/#/c/46181/1/doc/source/webapi/v2.rst

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/47668

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/47668
Committed: http://github.com/openstack/ceilometer/commit/af18e308b3d21b353e7ec120faf6d0e0408a1f13
Submitter: Jenkins
Branch: master

commit af18e308b3d21b353e7ec120faf6d0e0408a1f13
Author: Terri Yu <email address hidden>
Date: Sat Sep 21 03:48:56 2013 +0000

    Add example with return values in API v2 docs

    Add a "real" example of a groupby statistics query with return
    values in API v2 documentation.

    The example is taken from an actual query run on a machine
    running Devstack and Ceilometer.

    Addresses bug # 1228465

    Change-Id: I0414fdaf31ca365f0404c77504d4106de7c17f74