We have a configuration option "tablets_mode_for_new_keyspaces" which
determines whether new keyspaces should use tablets or vnodes.
For some reason, this configuration parameter was never marked live-
updatable, so in this patch we add flag. No other changes are needed -
the existing code that uses this flag always uses it through the
up-to-date configuration.
In the previous patches we start to honor tablets_mode_for_new_keyspaces
also in Alternator CreateTable, and we wanted to test this but couldn't
do this in test/alternator because the option was not live-updatable.
Now that it will be, we'll be able to test this feature in
test/alternator.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
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