HADOOP-16832 Update S3Guard testing doc.

[mukund-thakur]

NOTICE

Please create an issue in ASF JIRA before opening a pull request,
and you need to set the title of the pull request which starts with
the corresponding JIRA issue number. (e.g. HADOOP-XXXXX. Fix a typo in YYY.)
For more details, please see https://cwiki.apache.org/confluence/display/HADOOP/How+To+Contribute

[steveloughran]

You get those options set when you build with -Ds3guard -Ddynamo ; you shouldn't need to set them in the code. As once you do that, you can't turn them off.

[mukund-thakur]

@steveloughran Yes i can use these option while running the tests using command line. But I was trying to run using Intellij idea and i had to set these params in auth-keys.xml.

[bgaborg]

Please add this that you should set this just locally If you want to run tests in your IDE and don't want to play with parameters passed in the run configuration.
Local configuration is stored in auth-keys.xml. The changes to that file won't be committed, so it's safe to store local config there.

[bgaborg]

@steveloughran what do you think about adding this to the doc? It may help people who are starting to contribute set things up more easily.

[steveloughran]

It needs a sentence at the beginning:

How to set test options in your hadoop configuration rather than on the maven command line.

And at the end

warning although easier for IDE debugging setups, once you do this, you cannot change configurations on the mvn command line, such as testing without s3guard.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	25m 31s	Docker mode activated.
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+1 💚	dupname	0m 0s	No case conflicting files found.
+0 🆗	markdownlint	0m 0s	markdownlint was not available.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
		_ trunk Compile Tests _
+1 💚	mvninstall	19m 37s	trunk passed
+1 💚	mvnsite	0m 40s	trunk passed
+1 💚	shadedclient	32m 41s	branch has no errors when building and testing our client artifacts.
		_ Patch Compile Tests _
+1 💚	mvninstall	0m 33s	the patch passed
+1 💚	mvnsite	0m 32s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	shadedclient	13m 25s	patch has no errors when building and testing our client artifacts.
		_ Other Tests _
+1 💚	asflicense	0m 30s	The patch does not generate ASF License warnings.
		74m 59s

Subsystem	Report/Notes
Docker	Client=19.03.5 Server=19.03.5 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1822/3/artifact/out/Dockerfile
GITHUB PR	#1822
Optional Tests	dupname asflicense mvnsite markdownlint
uname	Linux 1185ad913813 4.15.0-60-generic #67-Ubuntu SMP Thu Aug 22 16:55:30 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
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git revision	trunk / 1e3a0b0
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modules	C: hadoop-tools/hadoop-aws U: hadoop-tools/hadoop-aws
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versions	git=2.7.4 maven=3.3.9
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[bgaborg]

LGTM +1 committing