HBASE-22358 Change rubocop configuration for method length

[murtazahassan123]

Changed configuration and analyzed the code and the change in configuration works.

[HorizonNet]

LGTM, pending QA.

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	57	Docker mode activated.
		_ Prechecks _
0	yamllint	0	yamllint was not available.
+1	@author	0	The patch does not contain any @author tags.
-0	test4tests	1	The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
		_ master Compile Tests _
+1	mvninstall	408	master passed
+1	javadoc	49	master passed
		_ Patch Compile Tests _
+1	mvninstall	412	the patch passed
+1	whitespace	0	The patch has no whitespace issues.
+1	javadoc	40	the patch passed
		_ Other Tests _
+1	unit	486	hbase-shell in the patch passed.
+1	asflicense	11	The patch does not generate ASF License warnings.
		2075

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-227/1/artifact/out/Dockerfile
GITHUB PR	#227
Optional Tests	dupname asflicense javac javadoc unit yamllint
uname	Linux d6a6abbd4f30 4.4.0-143-generic #169~14.04.2-Ubuntu SMP Wed Feb 13 15:00:41 UTC 2019 x86_64 GNU/Linux
Build tool	maven
Personality	/testptch/patchprocess/precommit/personality/provided.sh
git revision	master / 46fe983
maven	version: Apache Maven 3.5.4 (1edded0938998edf8bf061f1ceb3cfdeccf443fe; 2018-06-17T18:33:14Z)
Default Java	1.8.0_181
Test Results	https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-227/1/testReport/
Max. process+thread count	2611 (vs. ulimit of 10000)
modules	C: hbase-shell U: hbase-shell
Console output	https://builds.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-227/1/console
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[HorizonNet]

Merged to master. Thanks @SyedMurtazaHassan!