HADOOP-18016. Make certain methods LimitedPrivate in S3AUtils.java

[mehakmeet]

No tests included since it's just an annotation change.
Ran the test suite after compiling successfully.
Region: ap-south-1

Tests:
[WARNING] Tests run: 588, Failures: 0, Errors: 0, Skipped: 5
[ERROR] Tests run: 1471, Failures: 0, Errors: 2, Skipped: 466(my bucket specific failures, ignore)
[ERROR] Tests run: 151, Failures: 1, Errors: 1, Skipped: 28(my bucket specific failures, ignore)

[mehakmeet]

CC: @steveloughran @mukund-thakur

[mukund-thakur]

Looks good.
Remove "proxy support from the commit message"

[mukund-thakur]

LGTM +1

[mukund-thakur]

Yetus failed. I don't how to retrigger.

[steveloughran]

just rebase and resubmit.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 46s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
-1 ❌	test4tests	0m 0s		The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
			_ trunk Compile Tests _
+1 💚	mvninstall	33m 51s		trunk passed
+1 💚	compile	0m 53s		trunk passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	compile	0m 46s		trunk passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	checkstyle	0m 33s		trunk passed
+1 💚	mvnsite	0m 52s		trunk passed
+1 💚	javadoc	0m 29s		trunk passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javadoc	0m 39s		trunk passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	spotbugs	1m 22s		trunk passed
+1 💚	shadedclient	21m 7s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 41s		the patch passed
+1 💚	compile	0m 44s		the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javac	0m 44s		the patch passed
+1 💚	compile	0m 36s		the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	javac	0m 36s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 22s		the patch passed
+1 💚	mvnsite	0m 41s		the patch passed
+1 💚	javadoc	0m 19s		the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javadoc	0m 28s		the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	spotbugs	1m 20s		the patch passed
+1 💚	shadedclient	20m 45s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	2m 31s		hadoop-aws in the patch passed.
+1 💚	asflicense	0m 36s		The patch does not generate ASF License warnings.
		90m 55s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3685/3/artifact/out/Dockerfile
GITHUB PR	#3685
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell
uname	Linux b896794c6ab4 4.15.0-156-generic #163-Ubuntu SMP Thu Aug 19 23:31:58 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 28d9a76
Default Java	Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3685/3/testReport/
Max. process+thread count	621 (vs. ulimit of 5500)
modules	C: hadoop-tools/hadoop-aws U: hadoop-tools/hadoop-aws
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3685/3/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[mukund-thakur]

Merging as yetus if only failing for no new tests and new tests are not required for this PR.