YARN-11790: TestAmFilter#testProxyUpdate fails in some networks

[cnauroth]

Description of PR

JIRA: YARN-11790: TestAmFilter#testProxyUpdate fails in some networks.

While working on SPARK-51408, I discovered an issue that can cause their AmIpFilterSuite#testProxyUpdate to fail in certain unusual network setups. This test is a fork of a YARN test from Hadoop. As part of the solution, I included some additional randomization on a fake host name intended to simulate an unresolvable host. I'd like to bring the same change back into the original YARN test to make sure this doesn't become a problem in Hadoop test runs and we keep the code in sync.

How was this patch tested?

mvn -o \
    -pl hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-web-proxy \
    test \
    -Dtest=TestAmFilter

For code changes:

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

[cnauroth]

Hello @slfan1989 . This is a one-liner test change that keeps in sync with another recent test change in Spark. Can I please get your code review? Thank you.

CC: @pan3793

[slfan1989]

Hello @slfan1989 . This is a one-liner test change that keeps in sync with another recent test change in Spark. Can I please get your code review? Thank you.

CC: @pan3793

Thanks for the contribution! LGTM.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 19s		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	24m 5s		trunk passed
+1 💚	compile	0m 17s		trunk passed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04
+1 💚	compile	0m 17s		trunk passed with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
+1 💚	checkstyle	0m 18s		trunk passed
+1 💚	mvnsite	0m 21s		trunk passed
+1 💚	javadoc	0m 24s		trunk passed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04
+1 💚	javadoc	0m 19s		trunk passed with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
+1 💚	spotbugs	0m 34s		trunk passed
+1 💚	shadedclient	19m 57s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 12s		the patch passed
+1 💚	compile	0m 13s		the patch passed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04
+1 💚	javac	0m 13s		the patch passed
+1 💚	compile	0m 10s		the patch passed with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
+1 💚	javac	0m 10s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 9s		the patch passed
+1 💚	mvnsite	0m 13s		the patch passed
+1 💚	javadoc	0m 12s		the patch passed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04
+1 💚	javadoc	0m 13s		the patch passed with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
+1 💚	spotbugs	0m 32s		the patch passed
+1 💚	shadedclient	20m 32s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	0m 55s		hadoop-yarn-server-web-proxy in the patch passed.
+1 💚	asflicense	0m 24s		The patch does not generate ASF License warnings.
		71m 47s

Subsystem	Report/Notes
Docker	ClientAPI=1.48 ServerAPI=1.48 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7478/1/artifact/out/Dockerfile
GITHUB PR	#7478
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
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Build tool	maven
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Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7478/1/testReport/
Max. process+thread count	560 (vs. ulimit of 5500)
modules	C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-web-proxy U: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-web-proxy
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7478/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[slfan1989]

@cnauroth Thanks for the contribution! @pan3793 Thanks for the review! Merged into trunk.

[slfan1989]

@cnauroth I cherry-pick this pr to branch-3.4.

cc: @steveloughran

[cnauroth]

Thank @slfan1989 and @pan3793 !