HBASE-22484 Javadoc Warnings: Fix warnings coming due to @result tag i…

[murtazahassan123]

…n TestCoprocessorWhitelistMasterObserver

[HorizonNet]

Approved, pending QA.

[Apache-HBase]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	45	Docker mode activated.
		_ Prechecks _
+1	hbaseanti	0	Patch does not have any anti-patterns.
+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.
		_ master Compile Tests _
+1	mvninstall	277	master passed
+1	compile	59	master passed
+1	checkstyle	75	master passed
+1	shadedjars	281	branch has no errors when building our shaded downstream artifacts.
+1	findbugs	223	master passed
+1	javadoc	37	master passed
		_ Patch Compile Tests _
+1	mvninstall	259	the patch passed
+1	compile	58	the patch passed
+1	javac	58	the patch passed
+1	checkstyle	79	the patch passed
+1	whitespace	0	The patch has no whitespace issues.
+1	shadedjars	289	patch has no errors when building our shaded downstream artifacts.
+1	hadoopcheck	1050	Patch does not cause any errors with Hadoop 2.8.5 2.9.2 or 3.0.3 3.1.2.
+1	findbugs	182	the patch passed
+1	javadoc	34	the patch passed
		_ Other Tests _
-1	unit	16935	hbase-server in the patch failed.
+1	asflicense	39	The patch does not generate ASF License warnings.
		20276

Reason	Tests
Failed junit tests	hadoop.hbase.client.TestFromClientSide
	hadoop.hbase.client.TestFromClientSide3

Subsystem	Report/Notes
Docker	Client=17.05.0-ce Server=17.05.0-ce base: https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-256/1/artifact/out/Dockerfile
GITHUB PR	#256
Optional Tests	dupname asflicense javac javadoc unit findbugs shadedjars hadoopcheck hbaseanti checkstyle compile
uname	Linux 0ab802694ff4 3.13.0-153-generic #203-Ubuntu SMP Thu Jun 14 08:52:28 UTC 2018 x86_64 GNU/Linux
Build tool	maven
Personality	/testptch/patchprocess/precommit/personality/provided.sh
git revision	master / b4dc778
maven	version: Apache Maven 3.5.4 (1edded0938998edf8bf061f1ceb3cfdeccf443fe; 2018-06-17T18:33:14Z)
Default Java	1.8.0_181
findbugs	v3.1.11
unit	https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-256/1/artifact/out/patch-unit-hbase-server.txt
Test Results	https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-256/1/testReport/
Max. process+thread count	4955 (vs. ulimit of 10000)
modules	C: hbase-server U: hbase-server
Console output	https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-256/1/console
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