HADOOP-19587. SSE-C integration changes.

[ahmarsuhail]

Description of PR

Based off of https://github.com/apache/hadoop/pull/7738/files, continuing the work here.

How was this patch tested?

tested in eu-west-1, with AAL enabled and encryption method set to SSE-C.

All good, other than failures when reading from a public bucket with SSE-C enabled.

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?

[ahmarsuhail]

@steveloughran addressed your review comments on https://github.com/apache/hadoop/pull/7738/files here

[hadoop-yetus]

🎊 +1 overall

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			_ trunk Compile Tests _
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			_ Patch Compile Tests _
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			_ Other Tests _
+1 💚	unit	2m 29s		hadoop-aws in the patch passed.
+1 💚	asflicense	0m 22s		The patch does not generate ASF License warnings.
		81m 3s

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GITHUB PR	#7906
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modules	C: hadoop-tools/hadoop-aws U: hadoop-tools/hadoop-aws
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versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 21s		Docker mode activated.
			_ Prechecks _
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+1 💚	test4tests	0m 0s		The patch appears to include 2 new or modified test files.
			_ trunk Compile Tests _
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			_ Patch Compile Tests _
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			_ Other Tests _
+1 💚	unit	2m 36s		hadoop-aws in the patch passed.
+1 💚	asflicense	0m 25s		The patch does not generate ASF License warnings.
		79m 40s

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Docker	ClientAPI=1.51 ServerAPI=1.51 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7906/2/artifact/out/Dockerfile
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modules	C: hadoop-tools/hadoop-aws U: hadoop-tools/hadoop-aws
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versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 35s		Docker mode activated.
			_ Prechecks _
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			_ trunk Compile Tests _
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			_ Patch Compile Tests _
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			_ Other Tests _
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		142m 2s

Subsystem	Report/Notes
Docker	ClientAPI=1.51 ServerAPI=1.51 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7906/4/artifact/out/Dockerfile
GITHUB PR	#7906
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Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7906/4/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

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[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	20m 44s		Docker mode activated.
			_ Prechecks _
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			_ trunk Compile Tests _
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			_ Patch Compile Tests _
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			_ Other Tests _
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+1 💚	asflicense	0m 38s		The patch does not generate ASF License warnings.
		162m 43s

Subsystem	Report/Notes
Docker	ClientAPI=1.51 ServerAPI=1.51 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7906/3/artifact/out/Dockerfile
GITHUB PR	#7906
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Max. process+thread count	569 (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-7906/3/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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