When using Swift storage for Gnocchi we want to add a filter to the
Ceilometer middleware for Swift to exclude reporting traffic caused
by Gnocchi storing data into Swift to avoid feedback-loops. This
is typically done by isolating the Gnocchi in a dedicated Project in
Keystone.
The best place to filter this traffic is in the middleware
as opposed to filtering in the Ceilometer Collector.
Related-To: I67b5bff394ad35cf95d10ba32d602954799d7348
Change-Id: If20248494d4e6c127db4ffdf77ae43482f64fe58
1d55c377b8