YARN-11298. Improve Yarn Router Junit Test Close MockRM.

[slfan1989]

JIRA: YARN-11298. Improve Yarn Router Junit Test Close MockRM.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 49s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+0 🆗	detsecrets	0m 1s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 4 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	39m 18s		trunk passed
+1 💚	compile	0m 48s		trunk passed with JDK Ubuntu-11.0.16+8-post-Ubuntu-0ubuntu120.04
+1 💚	compile	0m 39s		trunk passed with JDK Private Build-1.8.0_342-8u342-b07-0ubuntu1~20.04-b07
+1 💚	checkstyle	0m 44s		trunk passed
+1 💚	mvnsite	0m 51s		trunk passed
+1 💚	javadoc	0m 56s		trunk passed with JDK Ubuntu-11.0.16+8-post-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 36s		trunk passed with JDK Private Build-1.8.0_342-8u342-b07-0ubuntu1~20.04-b07
+1 💚	spotbugs	1m 16s		trunk passed
+1 💚	shadedclient	20m 33s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 27s		the patch passed
+1 💚	compile	0m 31s		the patch passed with JDK Ubuntu-11.0.16+8-post-Ubuntu-0ubuntu120.04
+1 💚	javac	0m 31s		the patch passed
+1 💚	compile	0m 27s		the patch passed with JDK Private Build-1.8.0_342-8u342-b07-0ubuntu1~20.04-b07
+1 💚	javac	0m 27s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	0m 23s	/results-checkstyle-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-server_hadoop-yarn-server-router.txt	hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router: The patch generated 3 new + 0 unchanged - 0 fixed = 3 total (was 0)
+1 💚	mvnsite	0m 28s		the patch passed
+1 💚	javadoc	0m 24s		the patch passed with JDK Ubuntu-11.0.16+8-post-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 27s		the patch passed with JDK Private Build-1.8.0_342-8u342-b07-0ubuntu1~20.04-b07
+1 💚	spotbugs	0m 56s		the patch passed
+1 💚	shadedclient	20m 9s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	3m 40s		hadoop-yarn-server-router in the patch passed.
+1 💚	asflicense	0m 43s		The patch does not generate ASF License warnings.
		96m 43s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4870/1/artifact/out/Dockerfile
GITHUB PR	#4870
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 7193681d9c05 4.15.0-191-generic #202-Ubuntu SMP Thu Aug 4 01:49:29 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 575e3aa
Default Java	Private Build-1.8.0_342-8u342-b07-0ubuntu1~20.04-b07
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.16+8-post-Ubuntu-0ubuntu120.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_342-8u342-b07-0ubuntu1~20.04-b07
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4870/1/testReport/
Max. process+thread count	727 (vs. ulimit of 5500)
modules	C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router U: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4870/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[slfan1989]

@goiri Please help to review the code, thank you very much!

[slfan1989]

@goiri Thank you very much for your help reviewing the code!