[HBASE-24893] [branch-1] Fix failing TestLogLevel unit test on ci-hadoop

[Abhey]

This PR introduces changes to fix the failing TestLogLevel unit tests.

Post making this change I looked into the branch-2 tests on ci-hadoop and found that the same test was passing for the same profile ie [JDK 8 + Hadoop 2]. So I delved into the code-base for this test in branch-2 and found that a similar fix had already been done to branch-2 as part of HBASE-23829. Here is the link to the PR introducing similar code change in branch-2 - https://github.com/apache/hbase/pull/1296/files#diff-88475ac51af9e041c429e33afc3e8ca0

This PR basically cherrypicks the changes in the TestLogLevel class as introduced in #1296

[Apache-HBase]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	12m 5s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+1 💚	hbaseanti	0m 0s	Patch does not have any anti-patterns.
+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.
		_ branch-1 Compile Tests _
+1 💚	mvninstall	10m 8s	branch-1 passed
+1 💚	compile	0m 40s	branch-1 passed with JDK v1.8.0_262
+1 💚	compile	0m 44s	branch-1 passed with JDK v1.7.0_272
+1 💚	checkstyle	1m 40s	branch-1 passed
+1 💚	shadedjars	3m 0s	branch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 47s	branch-1 passed with JDK v1.8.0_262
+1 💚	javadoc	0m 40s	branch-1 passed with JDK v1.7.0_272
+0 🆗	spotbugs	3m 0s	Used deprecated FindBugs config; considering switching to SpotBugs.
+1 💚	findbugs	2m 57s	branch-1 passed
		_ Patch Compile Tests _
+1 💚	mvninstall	1m 53s	the patch passed
+1 💚	compile	0m 43s	the patch passed with JDK v1.8.0_262
+1 💚	javac	0m 43s	the patch passed
+1 💚	compile	0m 45s	the patch passed with JDK v1.7.0_272
+1 💚	javac	0m 45s	the patch passed
+1 💚	checkstyle	1m 27s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	shadedjars	2m 59s	patch has no errors when building our shaded downstream artifacts.
+1 💚	hadoopcheck	4m 52s	Patch does not cause any errors with Hadoop 2.8.5 2.9.2.
+1 💚	javadoc	0m 32s	the patch passed with JDK v1.8.0_262
+1 💚	javadoc	0m 41s	the patch passed with JDK v1.7.0_272
+1 💚	findbugs	2m 54s	the patch passed
		_ Other Tests _
-1 ❌	unit	152m 24s	hbase-server in the patch failed.
+1 💚	asflicense	0m 37s	The patch does not generate ASF License warnings.
		206m 4s

Reason	Tests
Failed junit tests	hadoop.hbase.replication.TestReplicationSmallTests

Subsystem	Report/Notes
Docker	Client=19.03.12 Server=19.03.12 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2338/1/artifact/out/Dockerfile
GITHUB PR	#2338
JIRA Issue	HBASE-24893
Optional Tests	dupname asflicense javac javadoc unit spotbugs findbugs shadedjars hadoopcheck hbaseanti checkstyle compile
uname	Linux 964c95872a7d 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	/home/jenkins/jenkins-home/workspace/Base-PreCommit-GitHub-PR_PR-2338/out/precommit/personality/provided.sh
git revision	branch-1 / 041debd
Default Java	1.7.0_272
Multi-JDK versions	/usr/lib/jvm/zulu-8-amd64:1.8.0_262 /usr/lib/jvm/zulu-7-amd64:1.7.0_272
unit	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2338/1/artifact/out/patch-unit-hbase-server.txt
Test Results	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2338/1/testReport/
Max. process+thread count	4296 (vs. ulimit of 10000)
modules	C: hbase-server U: hbase-server
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2338/1/console
versions	git=1.9.1 maven=3.0.5 findbugs=3.0.1
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[virajjasani]

Triggered build one more time.

[Apache-HBase]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 10s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+1 💚	hbaseanti	0m 0s	Patch does not have any anti-patterns.
+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.
		_ branch-1 Compile Tests _
+1 💚	mvninstall	10m 10s	branch-1 passed
+1 💚	compile	0m 40s	branch-1 passed with JDK v1.8.0_262
+1 💚	compile	0m 44s	branch-1 passed with JDK v1.7.0_272
+1 💚	checkstyle	1m 39s	branch-1 passed
+1 💚	shadedjars	3m 1s	branch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 49s	branch-1 passed with JDK v1.8.0_262
+1 💚	javadoc	0m 40s	branch-1 passed with JDK v1.7.0_272
+0 🆗	spotbugs	3m 3s	Used deprecated FindBugs config; considering switching to SpotBugs.
+1 💚	findbugs	3m 0s	branch-1 passed
		_ Patch Compile Tests _
+1 💚	mvninstall	1m 54s	the patch passed
+1 💚	compile	0m 40s	the patch passed with JDK v1.8.0_262
+1 💚	javac	0m 40s	the patch passed
+1 💚	compile	0m 43s	the patch passed with JDK v1.7.0_272
+1 💚	javac	0m 43s	the patch passed
+1 💚	checkstyle	1m 29s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	shadedjars	2m 52s	patch has no errors when building our shaded downstream artifacts.
+1 💚	hadoopcheck	4m 34s	Patch does not cause any errors with Hadoop 2.8.5 2.9.2.
+1 💚	javadoc	0m 31s	the patch passed with JDK v1.8.0_262
+1 💚	javadoc	0m 42s	the patch passed with JDK v1.7.0_272
+1 💚	findbugs	2m 52s	the patch passed
		_ Other Tests _
-1 ❌	unit	154m 27s	hbase-server in the patch failed.
+1 💚	asflicense	0m 36s	The patch does not generate ASF License warnings.
		196m 54s

Reason	Tests
Failed junit tests	hadoop.hbase.master.TestWarmupRegion
	hadoop.hbase.mapreduce.TestSecureLoadIncrementalHFiles
	hadoop.hbase.regionserver.TestHRegion

Subsystem	Report/Notes
Docker	Client=19.03.12 Server=19.03.12 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2338/2/artifact/out/Dockerfile
GITHUB PR	#2338
Optional Tests	dupname asflicense javac javadoc unit spotbugs findbugs shadedjars hadoopcheck hbaseanti checkstyle compile
uname	Linux 702e416b3d1f 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	/home/jenkins/jenkins-home/workspace/Base-PreCommit-GitHub-PR_PR-2338/out/precommit/personality/provided.sh
git revision	branch-1 / fb654a9
Default Java	1.7.0_272
Multi-JDK versions	/usr/lib/jvm/zulu-8-amd64:1.8.0_262 /usr/lib/jvm/zulu-7-amd64:1.7.0_272
unit	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2338/2/artifact/out/patch-unit-hbase-server.txt
Test Results	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2338/2/testReport/
Max. process+thread count	4450 (vs. ulimit of 10000)
modules	C: hbase-server U: hbase-server
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2338/2/console
versions	git=1.9.1 maven=3.0.5 findbugs=3.0.1
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[apurtell]

Precommit results are unrelated. changes look good, let me do a quick local check before merge.