loadbalancer: add Gnocchi API support
loadbalancer: add Gnocchi API support

Add Gnocchi (OpenStack Metric storage) support in TripleO Loadbalancer config.

Change-Id: Ia991819f57616a9a11bd4dfb77893748130268a0

paramite/puppet-tripleo,openstack/puppet-tripleo,rdo-puppet-modules/puppet-tripleo,openstack/puppet-tripleo,rdo-puppet-modules/puppet-tripleo,paramite/puppet-tripleo,rdo-puppet-modules/puppet-tripleo,openstack/puppet-tripleo,paramite/puppet-tripleo