fix(disrupt_no_corrupt_repair): wait for schema agreement
fix(disrupt_no_corrupt_repair): wait for schema agreement

C-S thread creating keyspaces triggered in `_prepare_test_table`
may fail to write data and freeze if the nodes do not get to schema
agreement quickly enough
(due to Scylla's problem with schema management).
To avoid it we will wait for schema agreement each time after
calling `_prepare_test_table`.

This workaround should fix https://github.com/scylladb/scylla-cluster-tests/issues/5413

scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests