HADOOP-17402. Add GCS config to the core-site (#2638)

[ravwojdyla]

Follow up from: #2638 (comment)

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	7m 31s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 1 new or modified test files.
			_ branch-3.3 Compile Tests _
+1 💚	mvninstall	29m 57s		branch-3.3 passed
+1 💚	compile	17m 22s		branch-3.3 passed
+1 💚	checkstyle	0m 55s		branch-3.3 passed
+1 💚	mvnsite	1m 37s		branch-3.3 passed
+1 💚	javadoc	1m 41s		branch-3.3 passed
+1 💚	spotbugs	2m 22s		branch-3.3 passed
+1 💚	shadedclient	18m 5s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 2s		the patch passed
+1 💚	compile	18m 3s		the patch passed
+1 💚	javac	18m 3s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 54s		the patch passed
+1 💚	mvnsite	1m 35s		the patch passed
+1 💚	xml	0m 2s		The patch has no ill-formed XML file.
+1 💚	javadoc	1m 41s		the patch passed
+1 💚	spotbugs	2m 32s		the patch passed
+1 💚	shadedclient	18m 3s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	16m 45s		hadoop-common in the patch passed.
+1 💚	asflicense	0m 58s		The patch does not generate ASF License warnings.
		140m 26s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3180/1/artifact/out/Dockerfile
GITHUB PR	#3180
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient codespell xml spotbugs checkstyle
uname	Linux 08617521936b 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	branch-3.3 / 091a7ba
Default Java	Private Build-1.8.0_292-8u292-b10-0ubuntu1~18.04-b10
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3180/1/testReport/
Max. process+thread count	3158 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3180/1/console
versions	git=2.17.1 maven=3.6.0 spotbugs=4.2.2
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[steveloughran]

thanks, all merged in, JIRA closed, you get the credit there too.

Now, as you are looking at GCS, fancy looking at #2971 which is going to be a high performance yet correct committer for ABFS and GCS. If you are writing data to GCS right now through FileOutputCommitter, neither algorithm is safe....