anchor.diff:  provider = keystone.token.providers.pki.Provider
   
   # Keystone Token persistence backend driver. (string value)
  -#driver=keystone.token.backends.sql.Token
  +driver=keystone.token.backends.memcache.Token
   
   # Toggle for token system cacheing. This has no effect unless
   # global caching is enabled. (boolean value)
  -#caching=true
  +caching=true
   
   # Time to cache the revocation list and the revocation events
   # if revoke extension is enabled (in seconds). This has no
  
positive.code: # cache region. This should not need to be changed unless
  # there is another dogpile.cache region with the same
  # configuration name. (string value)
  #config_prefix=cache.keystone
  
  # Default TTL, in seconds, for any cached item in the
  # dogpile.cache region. This applies to any cached method that
  # doesn't have an explicit cache expiration time defined for
  # it. (integer value)
  #expiration_time=600
  
  # Dogpile.cache backend module. It is recommended that
  # Memcache (dogpile.cache.memcache) or Redis
  # (dogpile.cache.redis) be used in production deployments.
  # Small workloads (single process) like devstack can use the
  # dogpile.cache.memory backend. (string value)
  #backend=keystone.common.cache.noop
  
  # Use a key-mangling function (sha1) to ensure fixed length
  # cache-keys. This is toggle-able for debugging purposes, it
  # is highly recommended to always leave this set to True.
  # (boolean value)
  #use_key_mangler=true
  
  # Arguments supplied to the backend module. Specify this
  # option once per argument to be passed to the dogpile.cache
  # backend. Example format: "<argname>:<value>". (multi valued)
  #backend_argument=
  
  # Proxy Classes to import that will affect the way the
  # dogpile.cache backend functions. See the dogpile.cache
  
negative.code: 
  # Time to cache tokens (in seconds). This has no effect unless
  # global and token caching are enabled. (integer value)
  cache_time=3600
  
  # Revoke token by token identifier.  Setting revoke_by_id to
  # True enables various forms of enumerating tokens, e.g. `list
  