Add "IF NOT EXISTS" in a number of places
I want to use the return value of applying this schema in a script and usually it is non-zero becuause the coordinator keyspace already exists and without the IF NOT EXISTS cqlsh will send a return value of 2.
DROP KEYSPACE IF EXISTS transfer;
-CREATE KEYSPACE transfer WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1 };
-CREATE KEYSPACE coordinator WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1 };
+CREATE KEYSPACE IF NOT EXISTS transfer WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1 };
+CREATE KEYSPACE IF NOT EXISTS coordinator WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1 };
-CREATE TABLE transfer.tx_transfer (
+CREATE TABLE IF NOT EXISTS transfer.tx_transfer (
account_id int,
account_type int,
balance int,
