db/schema_tables: Wire up drop keyspace notifications
db/schema_tables: Wire up drop keyspace notifications

Signed-off-by: Pekka Enberg <add4fcd06328a394f0ad91feda7ee057316dc5ed@scylladb.com>

avikivity/scylla,kjniemi/scylla,kjniemi/scylla,avikivity/scylla,avikivity/scylla,duarten/scylla,duarten/scylla,raphaelsc/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla,raphaelsc/scylla,kjniemi/scylla,scylladb/scylla,raphaelsc/scylla,duarten/scylla