When pending cap releases fill up one message, start a work to send
cap release message. (old way is sending cap releases every 5 seconds)
Signed-off-by: N"Yan, Zheng" <zyan@redhat.com>
Reviewed-by: NJeff Layton <jlayton@redhat.com>
Signed-off-by: NIlya Dryomov <idryomov@gmail.com>