coordination_url[1] and metric_processing_delay[2] under storage
section are both deprecated, so deprecate parameters under
gnocchi::storage and migrate these parameters to appropriate
classes, gnocchi and gnocchi::metricd .
[1] 70b9ca427b
[2] 72fdba704d
Change-Id: I88dff282df4ce477e543dd2fcf5052a9ac472b84