Updated openstack/openstack
Project: openstack/ceilometer  eeab9ced74717a0ee4b2b5069147c1594053cd90
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Remove unnecessary escape character in string format

When format string, " quoted in "" pairs should be escaped, but
it is unnecessary when quoted in '' pairs.

Change-Id: Iec8adb7935521b1cd094c8b6e281e0c8e50a7825