HADOOP-18181. Move prefetch common classes to hadoop common

[steveloughran]

This moves the "common" classes for the prefetch code from hadoop-aws to hadoop common under org.apache.hadoop.fs.impl.prefetch

How was this patch tested?

s3 london; all good apart from landsat scale test timeout which i am now seeing everywhere

For code changes:

• [ ] Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• [x] 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?

[steveloughran]

• @mukund-thakur can you look at this?

[hadoop-yetus]

:confetti_ball: +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 :ok:	reexec	0m 52s		Docker mode activated.
			_ Prechecks _
+1 :green_heart:	dupname	0m 2s		No case conflicting files found.
+0 :ok:	codespell	0m 1s		codespell was not available.
+0 :ok:	detsecrets	0m 1s		detect-secrets was not available.
+1 :green_heart:	@author	0m 0s		The patch does not contain any @author tags.
+1 :green_heart:	test4tests	0m 0s		The patch appears to include 43 new or modified test files.
			_ feature-HADOOP-18028-s3a-prefetch Compile Tests _
+0 :ok:	mvndep	14m 39s		Maven dependency ordering for branch
+1 :green_heart:	mvninstall	24m 55s		feature-HADOOP-18028-s3a-prefetch passed
+1 :green_heart:	compile	23m 10s		feature-HADOOP-18028-s3a-prefetch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 :green_heart:	compile	20m 37s		feature-HADOOP-18028-s3a-prefetch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 :green_heart:	checkstyle	4m 30s		feature-HADOOP-18028-s3a-prefetch passed
+1 :green_heart:	mvnsite	3m 43s		feature-HADOOP-18028-s3a-prefetch passed
+1 :green_heart:	javadoc	2m 57s		feature-HADOOP-18028-s3a-prefetch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 :green_heart:	javadoc	2m 40s		feature-HADOOP-18028-s3a-prefetch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 :green_heart:	spotbugs	5m 2s		feature-HADOOP-18028-s3a-prefetch passed
+1 :green_heart:	shadedclient	22m 34s		branch has no errors when building and testing our client artifacts.
-0 :warning:	patch	23m 6s		Used diff version of patch file. Binary files and potentially other changes not applied. Please rebase and squash commits if necessary.
			_ Patch Compile Tests _
+0 :ok:	mvndep	0m 33s		Maven dependency ordering for patch
+1 :green_heart:	mvninstall	1m 46s		the patch passed
+1 :green_heart:	compile	22m 24s		the patch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 :green_heart:	javac	22m 24s		the patch passed
+1 :green_heart:	compile	20m 48s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 :green_heart:	javac	20m 48s		the patch passed
+1 :green_heart:	blanks	0m 0s		The patch has no blanks issues.
+1 :green_heart:	checkstyle	4m 16s		the patch passed
+1 :green_heart:	mvnsite	3m 34s		the patch passed
+1 :green_heart:	javadoc	2m 52s		the patch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 :green_heart:	javadoc	2m 43s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 :green_heart:	spotbugs	5m 12s		the patch passed
+1 :green_heart:	shadedclient	22m 39s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 :green_heart:	unit	18m 56s		hadoop-common in the patch passed.
+1 :green_heart:	unit	3m 27s		hadoop-aws in the patch passed.
+1 :green_heart:	asflicense	1m 35s		The patch does not generate ASF License warnings.
		242m 3s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4690/8/artifact/out/Dockerfile
GITHUB PR	https://github.com/apache/hadoop/pull/4690
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 4fc7f1caf820 4.15.0-169-generic #177-Ubuntu SMP Thu Feb 3 10:50:38 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	feature-HADOOP-18028-s3a-prefetch / 21b53182d8bcca137464a69ffdd564fbbf68649f
Default Java	Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4690/8/testReport/
Max. process+thread count	1251 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common hadoop-tools/hadoop-aws U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4690/8/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

This message was automatically generated.

[steveloughran]

ready for review again @mukund-thakur