Commit 75cf255c67 (repair: Ignore keyspace
that is removed in sync_data_using_repair) is not enough to fix the
issue because when the repair master checks if the table is dropped, the
table might not be dropped yet on the repair master.
To fix, the repair master should check if the follower failed the repair
because the table is dropped by checking the error returned from
follower.
With this patch, we would see
WARN 2020-04-14 11:19:00,417 [shard 0] repair - repair id 1 on shard 0
completed successfully, keyspace=ks, ignoring dropped tables={cf}
when the table is dropped during bootstrap.
Tests: update_cluster_layout_tests.py:TestUpdateClusterLayout.simple_add_new_node_while_schema_changes_test
Fixes: #5942
c02fea5f04