This updates various parts of the devstack plugin:
* The fetcher is now configurable via the "CLOUDKITTY_FETCHER" variable and
defaults to gnocchi (this allows the user to have immediate results).
* The "CLOUDKITTY_SERVICES" variable was removed as it is not used anymore.
* The storage backend does now default to "influxdb". If this storage backend is
selected, influxdb is installed. This can be done on fedora and ubuntu. The
storage backend to use in devstack can be configured through the
``CLOUDKITTY_STORAGE_BACKEND`` and ``CLOUDKITTY_STORAGE_VERSION`` variables.
* Some details about available variables have been added to the devstack
documentation. Since the "admin/quick_deployment" section did only contain
the devstack documentation, it has been removed for now.
* Given that the "ceilometer-low" archive-policy (default in devstack) only
provides the "mean" aggregation method, it is now the aggregation method
used in the default metrics.yml file.
Change-Id: I37452772de163b5fafc502917af870c86a3d38b2