Discard non existent attempts on DDL #132

Job	Run time
copy_test	4m 33s
copy_and_stream_test	6m 23s
order_test	2m 0s
feature_tests (transform_filter)	2m 11s
resume_test	2m 16s
stream_only_test	2m 39s
feature_tests (ddl)	1m 31s
feature_tests (postgres)	5m 22s
feature_tests (postgres_data_type)	2m 13s
feature_tests (multi_tenant)	1m 56s
feature_tests (routing)	1m 32s
	32m 36s

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