Description of common configuration options

Configuration option = Default value	Description
[DEFAULT]
memcached_servers = None	(ListOpt) Memcached servers or None for in process cache.
[keystone_authtoken]
memcached_servers = None	(ListOpt) Optionally specify a list of memcached server(s) to use for caching. If left undefined, tokens will instead be cached in-process.
[oslo_concurrency]
disable_process_locking = False	(BoolOpt) Enables or disables inter-process locks.
lock_path = None	(StrOpt) Directory to use for lock files. For security, the specified directory should only be writable by the user running the processes that need locking. Defaults to environment variable OSLO_LOCK_PATH. If external locks are used, a lock path must be set.