Description of configuration options for filesystem

Configuration option = Default value	Description
[DEFAULT]
filesystem_store_datadir = None	(StrOpt) Directory to which the Filesystem backend store writes images.
filesystem_store_datadirs = None	(MultiStrOpt) List of directories and its priorities to which the Filesystem backend store writes images.
filesystem_store_metadata_file = None	(StrOpt) The path to a file which contains the metadata to be returned with any location associated with this store. The file must contain a valid JSON dict.