No type check for groupby in statistics

[Stéphane Albert]

The groupby parameter is not checked for its type. As a matter of fact, if it's a string, it gets expanded as multiple groupby parameters for every characters.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/80256

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/80256
Committed: https://git.openstack.org/cgit/openstack/python-ceilometerclient/commit/?id=f032b7ef848d248f5917ea30a2caaa7f6d4e6822
Submitter: Jenkins
Branch: master

commit f032b7ef848d248f5917ea30a2caaa7f6d4e6822
Author: Stéphane Albert <email address hidden>
Date: Thu Mar 13 12:42:06 2014 +0100

    Statistics groupby handling improvement

    The groupby parameter for statistics now handle single string as a
    parameter. It fixes the bug where every characters of the string where
    interpreted as a groupby value.

    Change-Id: Ia763741d7ad5717be381b0ac2f0acb57e9f46cac
    Closes-Bug: #1291935