Initial commit

Adding salt-formula for gnocchi 4.0. Two main roles are supported:
- server
- statsd
They could be installed on different nodes (and on same node too)
gnocchi:common class is used to provide common options for both.

Change-Id: I0e0c9dd4f6d0a1539b9e9aef0084282867012852
Related-Prod: https://mirantis.jira.com/browse/PROD-17704
48 files changed