Rewrite TestAvroConsumerConfluent with new Kafka source #2

Job	Run time
Pre-compile Checks / Basic QA	6m 58s
Default (Java 8) / Compile	21m 44s
Default (Java 8) / Test packaging/licensing	37m 24s
Default (Java 8) / Test (module: core)	35m 56s
Default (Java 8) / E2E (group 1)	2h 7m 48s
Default (Java 8) / Test (module: python)	31m 11s
Default (Java 8) / Test (module: table)	37m 47s
Default (Java 8) / Test (module: connect)	12m 52s
Default (Java 8) / Test (module: tests)	47m 57s
Default (Java 8) / E2E (group 2)	2h 32m 43s
Default (Java 8) / Test (module: misc)	54m 11s
	9h 26m 31s

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