Allow keystone endpoint_type interpolation for Heat clients

 - Add 'endpoint_type_default' identity parameter to access
   internal services, default 'internalURL'
 - Add 'endpoint_type_heat' identity parameter so Heat could
   provide it to external clients, default 'publicURL'

Change-Id: Iff99c7b79634c65605e8509cfe919bc47ff1a787
13 files changed