HBASE-25388 Using an extension of MockProducer on testing side

[akatona84]

No description provided.

[akatona84]

@meszibalu , @petersomogyi Could you pls review?

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 4s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+0 🆗	spotbugs	0m 0s	spotbugs executables are not available.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s	The patch appears to include 1 new or modified test files.
		_ master Compile Tests _
+1 💚	mvninstall	1m 24s	master passed
+1 💚	compile	0m 9s	master passed
+1 💚	javadoc	0m 7s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	0m 49s	the patch passed
+1 💚	compile	0m 8s	the patch passed
+1 💚	javac	0m 8s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	xml	0m 1s	The patch has no ill-formed XML file.
+1 💚	javadoc	0m 6s	the patch passed
		_ Other Tests _
+1 💚	unit	0m 10s	hbase-kafka-proxy in the patch passed.
		4m 7s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-Connectors-PreCommit/job/PR-76/1/artifact/yetus-precommit-check/output/Dockerfile
GITHUB PR	#76
Optional Tests	dupname javac javadoc unit xml compile spotbugs findbugs
uname	Linux 4c4b1ab8e1e1 5.4.0-1025-aws #25~18.04.1-Ubuntu SMP Fri Sep 11 12:03:04 UTC 2020 x86_64 GNU/Linux
Build tool	hb_maven
Personality	dev-support/jenkins/hbase-personality.sh
git revision	master / b45d91b
Default Java	Oracle Corporation-1.8.0_275-b01
Test Results	https://ci-hadoop.apache.org/job/HBase/job/HBase-Connectors-PreCommit/job/PR-76/1/testReport/
Max. process+thread count	62 (vs. ulimit of 12500)
modules	C: kafka/hbase-kafka-proxy U: kafka/hbase-kafka-proxy
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-Connectors-PreCommit/job/PR-76/1/console
versions	git=2.20.1
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[petersomogyi]

Thank you @akatona84 for the contribution!