support the database/collection name mapping #593

Job	Run time
milvus-cdc-function-test	10m 24s
milvus-cdc-function-test	10m 30s
milvus-cdc-function-test-4-16	10m 49s
milvus-cdc-function-test-4-16	10m 49s
milvus-cdc-function-test-16-8	9m 8s
milvus-cdc-function-test-16-8	9m 8s
milvus-cdc-function-test-with-db	10m 8s
milvus-cdc-function-test-with-db	10m 8s
milvus-cdc-system-test	19m 33s
milvus-cdc-system-test	19m 33s
	2h 0m 10s

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