HDFS-14683. WebHDFS: Add erasureCodingPolicy field to GETCONTENTSUMMARY response

[smengcl]

Added a unit test for JsonUtil#toJsonString(ContentSummary).
Amended WebHDFS doc.
Tested locally.

When the ecPolicy is empty, the request would just return empty string, i.e. ecPolicy: "".

[jojochuang]

+1

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	40	Docker mode activated.
		_ Prechecks _
+1	dupname	0	No case conflicting files found.
+1	@author	0	The patch does not contain any @author tags.
+1	test4tests	0	The patch appears to include 1 new or modified test files.
		_ trunk Compile Tests _
+1	mvninstall	1045	trunk passed
+1	compile	58	trunk passed
+1	checkstyle	39	trunk passed
+1	mvnsite	64	trunk passed
+1	shadedclient	728	branch has no errors when building and testing our client artifacts.
+1	javadoc	48	trunk passed
0	spotbugs	162	Used deprecated FindBugs config; considering switching to SpotBugs.
+1	findbugs	160	trunk passed
		_ Patch Compile Tests _
+1	mvninstall	57	the patch passed
+1	compile	55	the patch passed
+1	javac	55	the patch passed
-0	checkstyle	34	hadoop-hdfs-project/hadoop-hdfs: The patch generated 1 new + 34 unchanged - 0 fixed = 35 total (was 34)
+1	mvnsite	62	the patch passed
+1	whitespace	0	The patch has no whitespace issues.
+1	shadedclient	685	patch has no errors when building and testing our client artifacts.
+1	javadoc	45	the patch passed
+1	findbugs	170	the patch passed
		_ Other Tests _
-1	unit	6325	hadoop-hdfs in the patch failed.
-1	asflicense	31	The patch generated 6 ASF License warnings.
		9695

Reason	Tests
Failed junit tests	hadoop.hdfs.server.namenode.TestFileTruncate
	hadoop.hdfs.server.namenode.metrics.TestNameNodeMetrics
	hadoop.hdfs.server.namenode.TestFSEditLogLoader
	hadoop.hdfs.server.namenode.snapshot.TestSnapshot
	hadoop.hdfs.server.namenode.TestAddBlock
	hadoop.hdfs.server.namenode.TestINodeFile
	hadoop.hdfs.server.namenode.TestListCorruptFileBlocks
	hadoop.hdfs.server.namenode.TestFsck
	hadoop.hdfs.server.namenode.TestFSImageWithAcl
	hadoop.hdfs.server.namenode.snapshot.TestSnapshotRename
	hadoop.hdfs.server.datanode.fsdataset.impl.TestLazyPersistReplicaRecovery
	hadoop.hdfs.server.datanode.TestLargeBlockReport
	hadoop.hdfs.server.namenode.TestReencryptionWithKMS
	hadoop.hdfs.server.namenode.snapshot.TestOpenFilesWithSnapshot
	hadoop.hdfs.server.namenode.TestSecurityTokenEditLog
	hadoop.hdfs.server.namenode.TestReconstructStripedBlocks
	hadoop.hdfs.server.namenode.snapshot.TestSnapshotDeletion
	hadoop.hdfs.server.namenode.TestAddOverReplicatedStripedBlocks
	hadoop.hdfs.server.namenode.TestNameNodeAcl
	hadoop.hdfs.server.blockmanagement.TestUnderReplicatedBlocks
	hadoop.hdfs.server.namenode.snapshot.TestSnapRootDescendantDiff
	hadoop.hdfs.server.namenode.TestDefaultBlockPlacementPolicy
	hadoop.hdfs.server.namenode.TestListOpenFiles
	hadoop.hdfs.server.namenode.TestQuotaWithStripedBlocksWithRandomECPolicy
	hadoop.hdfs.server.namenode.metrics.TestNNMetricFilesInGetListingOps
	hadoop.hdfs.server.namenode.TestAddStripedBlocks
	hadoop.hdfs.server.namenode.TestAuditLoggerWithCommands
	hadoop.hdfs.server.namenode.snapshot.TestRenameWithSnapshots
	hadoop.hdfs.server.namenode.TestReencryption
	hadoop.hdfs.server.namenode.TestHDFSConcat
	hadoop.hdfs.server.namenode.TestSecondaryNameNodeUpgrade

Subsystem	Report/Notes
Docker	Client=19.03.1 Server=19.03.1 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1189/1/artifact/out/Dockerfile
GITHUB PR	#1189
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle
uname	Linux 6913b0346b0e 4.4.0-139-generic #165-Ubuntu SMP Wed Oct 24 10:58:50 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/hadoop.sh
git revision	trunk / f86de6f
Default Java	1.8.0_212
checkstyle	https://builds.apache.org/job/hadoop-multibranch/job/PR-1189/1/artifact/out/diff-checkstyle-hadoop-hdfs-project_hadoop-hdfs.txt
unit	https://builds.apache.org/job/hadoop-multibranch/job/PR-1189/1/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
Test Results	https://builds.apache.org/job/hadoop-multibranch/job/PR-1189/1/testReport/
asflicense	https://builds.apache.org/job/hadoop-multibranch/job/PR-1189/1/artifact/out/patch-asflicense-problems.txt
Max. process+thread count	4364 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-1189/1/console
versions	git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1
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