Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/2664
@rmetzger it appears that project artifacts are not included as transitive
dependencies and I had overlooked 0.9 as a dependency for the 0.10 connector.
After correcting this the provided hierarchy is as follows:
```
opt/connectors/streaming/kafka-0.10
opt/connectors/streaming/kafka-0.10/flink-connector-kafka-0.10_2.10-1.2-SNAPSHOT.jar
opt/connectors/streaming/kafka-0.10/flink-connector-kafka-0.9_2.10-1.2-SNAPSHOT.jar
opt/connectors/streaming/kafka-0.10/flink-connector-kafka-base_2.10-1.2-SNAPSHOT.jar
opt/connectors/streaming/kafka-0.10/kafka-clients-0.9.0.1.jar
opt/connectors/streaming/kafka-0.10/lz4-1.2.0.jar
opt/connectors/streaming/kafka-0.8
opt/connectors/streaming/kafka-0.8/flink-connector-kafka-0.8_2.10-1.2-SNAPSHOT.jar
opt/connectors/streaming/kafka-0.8/flink-connector-kafka-base_2.10-1.2-SNAPSHOT.jar
opt/connectors/streaming/kafka-0.8/kafka_2.10-0.8.2.2.jar
opt/connectors/streaming/kafka-0.8/scala-library-2.10.4.jar
opt/connectors/streaming/kafka-0.8/zkclient-0.3.jar
opt/connectors/streaming/kafka-0.9
opt/connectors/streaming/kafka-0.9/flink-connector-kafka-0.9_2.10-1.2-SNAPSHOT.jar
opt/connectors/streaming/kafka-0.9/flink-connector-kafka-base_2.10-1.2-SNAPSHOT.jar
opt/connectors/streaming/kafka-0.9/kafka-clients-0.9.0.1.jar
opt/connectors/streaming/kafka-0.9/lz4-1.2.0.jar
```
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