HADOOP-17951 AccessPoint verifyBucketExistsV2 always returns false

[bogthe]

Description of PR

Turns out there was a small issue with the previous implementation that
always returned false for verifyBucketExistsV2. The more "clearer"
way to check is for an error message when there's a 403. If that error
message is present then the AP doesn't exist (the only case when a 403
is returned for an AP), otherwise 404 means definite no.

How was this patch tested?

Ran mvn -Dparallel-tests -DtestsThreadCount=32 clean verify on eu-west-1 with access points enabled (i.e. bucket pointing to AP ARN).

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?

[bogthe]

@steveloughran small bug fix related to Access Point PR that went in last week.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 59s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 1s		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	34m 24s		trunk passed
+1 💚	compile	0m 45s		trunk passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	compile	0m 35s		trunk passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	checkstyle	0m 25s		trunk passed
+1 💚	mvnsite	0m 41s		trunk passed
+1 💚	javadoc	0m 21s		trunk passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javadoc	0m 28s		trunk passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	spotbugs	1m 9s		trunk passed
+1 💚	shadedclient	22m 12s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 34s		the patch passed
+1 💚	compile	0m 38s		the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javac	0m 38s		the patch passed
+1 💚	compile	0m 30s		the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	javac	0m 30s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 19s		the patch passed
+1 💚	mvnsite	0m 33s		the patch passed
+1 💚	javadoc	0m 14s		the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javadoc	0m 23s		the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	spotbugs	1m 12s		the patch passed
+1 💚	shadedclient	22m 4s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	2m 24s		hadoop-aws in the patch passed.
+1 💚	asflicense	0m 29s		The patch does not generate ASF License warnings.
		92m 5s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3516/1/artifact/out/Dockerfile
GITHUB PR	#3516
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell
uname	Linux c9924a59f421 4.15.0-142-generic #146-Ubuntu SMP Tue Apr 13 01:11:19 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 0aa3bec
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-3516/1/testReport/
Max. process+thread count	551 (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-3516/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[steveloughran]

+1