HDFS-17753. Fix occasional failure of TestRouterHttpServerXFrame.

[hfutatzhanghb]

Description of PR

JIRA: HDFS-17753. Fix occasional failure of TestRouterHttpServerXFrame.

We should use RouterConfigBuilder to init the configuration of Router and it will use free port automatically.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 20s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		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 1 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	26m 52s		trunk passed
+1 💚	compile	0m 38s		trunk passed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04
+1 💚	compile	0m 26s		trunk passed with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
+1 💚	checkstyle	0m 19s		trunk passed
+1 💚	mvnsite	0m 30s		trunk passed
+1 💚	javadoc	0m 29s		trunk passed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04
+1 💚	javadoc	0m 18s		trunk passed with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
+1 💚	spotbugs	0m 57s		trunk passed
+1 💚	shadedclient	20m 22s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 22s		the patch passed
+1 💚	compile	0m 28s		the patch passed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04
+1 💚	javac	0m 28s		the patch passed
+1 💚	compile	0m 20s		the patch passed with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
+1 💚	javac	0m 19s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 13s		the patch passed
+1 💚	mvnsite	0m 23s		the patch passed
+1 💚	javadoc	0m 17s		the patch passed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04
+1 💚	javadoc	0m 17s		the patch passed with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
+1 💚	spotbugs	0m 55s		the patch passed
+1 💚	shadedclient	20m 8s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	41m 50s		hadoop-hdfs-rbf in the patch passed.
+1 💚	asflicense	0m 26s		The patch does not generate ASF License warnings.
		117m 45s

Subsystem	Report/Notes
Docker	ClientAPI=1.48 ServerAPI=1.48 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7467/1/artifact/out/Dockerfile
GITHUB PR	#7467
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 000e60ca5111 5.15.0-130-generic #140-Ubuntu SMP Wed Dec 18 17:59:53 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / bbe452a
Default Java	Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7467/1/testReport/
Max. process+thread count	2867 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-rbf U: hadoop-hdfs-project/hadoop-hdfs-rbf
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7467/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[hfutatzhanghb]

@ayushtkn Sir, please help review this simple change when you have free time, Thanks a lot.

[ayushtkn]

LGTM

[slfan1989]

@hfutatzhanghb Thanks for the contribution! @ayushtkn Thanks for the review!