HADOOP-16939. fs.s3a.authoritative.path should support multiple FS URIs

[steveloughran]

add unit test, new ITest and then fix the issue: different schema, bucket == skip

factored out the underlying logic for unit testing; also moved
maybeAddTrailingSlash to S3AUtils (while retaining/forwarnding existing method
in S3AFS).

tested: london, sole failure is
testListingDeleteauth=true

...filed HADOOP-16853

Change-Id: I4b8d0024469551eda0ec70b4968cba4abed405ed

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 33s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 1s	No case conflicting files found.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s	The patch appears to include 2 new or modified test files.
		_ trunk Compile Tests _
+1 💚	mvninstall	19m 12s	trunk passed
+1 💚	compile	0m 35s	trunk passed
+1 💚	checkstyle	0m 27s	trunk passed
+1 💚	mvnsite	0m 39s	trunk passed
+1 💚	shadedclient	15m 30s	branch has no errors when building and testing our client artifacts.
+1 💚	javadoc	0m 31s	trunk passed
+0 🆗	spotbugs	1m 0s	Used deprecated FindBugs config; considering switching to SpotBugs.
+1 💚	findbugs	0m 58s	trunk passed
		_ Patch Compile Tests _
+1 💚	mvninstall	0m 33s	the patch passed
+1 💚	compile	0m 28s	the patch passed
+1 💚	javac	0m 28s	the patch passed
+1 💚	checkstyle	0m 20s	hadoop-tools/hadoop-aws: The patch generated 0 new + 32 unchanged - 1 fixed = 32 total (was 33)
+1 💚	mvnsite	0m 32s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	shadedclient	14m 14s	patch has no errors when building and testing our client artifacts.
+1 💚	javadoc	0m 25s	the patch passed
+1 💚	findbugs	1m 3s	the patch passed
		_ Other Tests _
+1 💚	unit	1m 16s	hadoop-aws in the patch passed.
+1 💚	asflicense	0m 31s	The patch does not generate ASF License warnings.
		59m 9s

Subsystem	Report/Notes
Docker	Client=19.03.8 Server=19.03.8 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1914/1/artifact/out/Dockerfile
GITHUB PR	#1914
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle
uname	Linux 1077dd506797 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
Personality	personality/hadoop.sh
git revision	trunk / e3fbdcb
Default Java	1.8.0_242
Test Results	https://builds.apache.org/job/hadoop-multibranch/job/PR-1914/1/testReport/
Max. process+thread count	421 (vs. ulimit of 5500)
modules	C: hadoop-tools/hadoop-aws U: hadoop-tools/hadoop-aws
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-1914/1/console
versions	git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1
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[steveloughran]

through yetus first time -I am pleasantly surprised.

Tested: S3 london