Handle the hardcoded configuration values

This patch allows to customize the hardcoded configuration values,
as well as introduce new configuration options for gnocchi services
by configmap template with the specified section:

    gnocchi:
      common:
        configmap:
          DEFAULT:
            debug: false
            verbose: true
      server:
        configmap:
          DEFAULT:
            debug: false
            verbose: true
          api:
            paste_config: api-paste.ini
            max_limit: 1000
      statsd:
        configmap:
          DEFAULT:
            debug: false
            verbose: true
          statsd:
            host: 0.0.0.0
            port: 8125

Change-Id: If2bfbe272020157c87766f4277b6da5b0577a4b7
Related-Prod: PROD-29627
4 files changed