NFSv4 client: (private) headers from libnfsidmap The private headers are needed in order to: nfsidmap_internal.h: * definition of struct trans_func * prototype for logger function cfg.h + queue.h: * prototype(s) for accessing rpc.idmpad configuration file Reviewed-by: Jakub Hrozek <jhrozek@redhat.com> Reviewed-by: Roland Mainz <rmainz@redhat.com>