Updated openstack/openstack
Project: openstack/ceilometer  6cadb312b774b40cd05eeb0db0bf40ec18d58da4
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Doc: Add OldSample to v2.rst

OldSample is still referenced in controllers/v2.py. In order for samples to be
generated in the documentation (thanks to the sample() class method), it must
also be referenced in doc/source/webapi/v2.rst.

Change-Id: Ie5bfe3aa1bc552630dad56eab3b2f921eb2b7690