This introduces the oslo healt check middleware
http://docs.openstack.org/developer/oslo.middleware/healthcheck_plugins.html
into the pipelines. This middleware is useful for load balancers and
http servers, which can use it to validate that the keystone services are
operational. This middleware is being used in other services such as
glance and magnum. This patch provides it for keystone, in an effort to
spread the usage across all major projects.
This is one less item that operators will have to patch locally.
DocImpact
Change-Id: I19e4fc8f6c6a227068ba7191c1e9c453fc08f061
eeac2cb6d1