As in C*, unrecognized sstable components should be ignored when loading a sstable. At the moment, Scylla fails to do so and will not boot as a result. In addition, unknown components should be remembered when moving a sstable or changing its generation. Fixes #1780. Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com> Message-Id: <b7af0c28e5b574fd577a7a1d28fb006ac197aa0a.1478025930.git.raphaelsc@scylladb.com>