The handler walks the list of tables and snapshots each one individually
(if needed). That's not very optimal, each such call starts a "snapshot
modification operation", which is switching to shard-0 for a lock, then
calls the snapshot of multiple tables giving it vector of a single name.
There's a method of snapshot-ctl that snapshots several tables at once,
no need to open-code it here.
One thing to care about -- the take_column_family_snapshot() throws when
the vector of table names is empty, so need an explicit skipping check.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
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