This patch adds a configuration option to choose whether the
SimpleStrategy replication strategy is restricted. It is a
tri_mode_restriction, allowing to restrict this strategy (true), to allow
it (false), or to just warn when it is used (warn).
After this patch, the option exists but doesn't yet do anything.
It will be used in the following two patches to restrict the
CREATE KEYSPACE and ALTER KEYSPACE operations, respectively.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
8a4ac6914a