Override cache and identity params in Gnocchi reclass

There is need to override cache and identity parameters on system
level of Gnocchi reclass, to have ability to run Gnocchi inside
separate cluster.

Change-Id: I4ddbcbf47bbd44eedc6cd0a3a6f4d3b12499bb53
Related-Prod: https://mirantis.jira.com/browse/PROD-17192
1 file changed