HDFS-16354. Add description of GETSNAPSHOTDIFFLISTING to WebHDFS doc.

[iwasakims]

https://issues.apache.org/jira/browse/HDFS-16354

HDFS-16091 (#3374) added GETSNAPSHOTDIFFLISTING op leveraging ClientProtocol#getSnapshotDiffReportListing.

[hadoop-yetus]

🎊 +1 overall

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+1 💚	@author	0m 0s		The patch does not contain any @author tags.
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+1 💚	mvninstall	46m 18s		trunk passed
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+1 💚	mvninstall	1m 18s		the patch passed
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[virajjasani]

Left one comment, looks good otherwise

[virajjasani]

good to mentioned that in the absence of snapshotdiffstartpath and snapshotdiffindex, their default values used will be empty string and -1 respectively.

[iwasakims]

I added description about default values of the parameters.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 36s		Docker mode activated.
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+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+0 🆗	markdownlint	0m 1s		markdownlint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
-1 ❌	mvninstall	3m 44s	/branch-mvninstall-root.txt	root in trunk failed.
-1 ❌	mvnsite	0m 22s	/branch-mvnsite-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs in trunk failed.
+1 💚	shadedclient	4m 58s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
-1 ❌	mvninstall	0m 23s	/patch-mvninstall-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs in the patch failed.
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-1 ❌	mvnsite	0m 23s	/patch-mvnsite-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs in the patch failed.
+1 💚	shadedclient	1m 12s		patch has no errors when building and testing our client artifacts.
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+0 🆗	asflicense	0m 23s		ASF License check generated no output?
		10m 17s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3740/2/artifact/out/Dockerfile
GITHUB PR	#3740
Optional Tests	dupname asflicense mvnsite codespell markdownlint
uname	Linux 1401992f54c6 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 10de5b8
Max. process+thread count	93 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs
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[virajjasani]

+1 (non-binding), pending QA

[hadoop-yetus]

🎊 +1 overall

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+0 🆗	reexec	1m 29s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+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	32m 35s		trunk passed
+1 💚	mvnsite	1m 31s		trunk passed
+1 💚	shadedclient	56m 44s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 28s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	1m 26s		the patch passed
+1 💚	shadedclient	21m 44s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 35s		The patch does not generate ASF License warnings.
		83m 56s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3740/3/artifact/out/Dockerfile
GITHUB PR	#3740
Optional Tests	dupname asflicense mvnsite codespell markdownlint
uname	Linux e7cd2bbec2f2 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 10de5b8
Max. process+thread count	718 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3740/3/console
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[ayushtkn]

LGTM

[iwasakims]

Thanks. I merged this.