YARN-9433. Remove unused constants in YARN resource manager

[hextriclosan]

I've checked that these constants are not used in the project at all.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	33	Docker mode activated.
		_ Prechecks _
+1	@author	0	The patch does not contain any @author tags.
-1	test4tests	0	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.
		_ trunk Compile Tests _
+1	mvninstall	1103	trunk passed
+1	compile	46	trunk passed
+1	checkstyle	37	trunk passed
+1	mvnsite	48	trunk passed
+1	shadedclient	740	branch has no errors when building and testing our client artifacts.
-1	findbugs	77	hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager in trunk has 2 extant Findbugs warnings.
+1	javadoc	29	trunk passed
		_ Patch Compile Tests _
+1	mvninstall	41	the patch passed
+1	compile	43	the patch passed
+1	javac	43	the patch passed
+1	checkstyle	32	the patch passed
+1	mvnsite	48	the patch passed
+1	whitespace	0	The patch has no whitespace issues.
+1	shadedclient	718	patch has no errors when building and testing our client artifacts.
+1	findbugs	84	the patch passed
+1	javadoc	26	the patch passed
		_ Other Tests _
-1	unit	4486	hadoop-yarn-server-resourcemanager in the patch failed.
-1	asflicense	23	The patch generated 1 ASF License warnings.
		7645

Reason	Tests
Failed junit tests	hadoop.yarn.server.resourcemanager.TestClientRMService
	hadoop.yarn.server.resourcemanager.applicationsmanager.TestAMRestart

Subsystem	Report/Notes
Docker	Client=17.05.0-ce Server=17.05.0-ce base: https://builds.apache.org/job/hadoop-multibranch/job/PR-706/1/artifact/out/Dockerfile
GITHUB PR	#706
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle
uname	Linux 1d022b726b71 4.4.0-138-generic #164-Ubuntu SMP Tue Oct 2 17:16:02 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/hadoop.sh
git revision	trunk / bb8dda2
maven	version: Apache Maven 3.3.9
Default Java	1.8.0_191
findbugs	v3.1.0-RC1
findbugs	https://builds.apache.org/job/hadoop-multibranch/job/PR-706/1/artifact/out/branch-findbugs-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-server_hadoop-yarn-server-resourcemanager-warnings.html
unit	https://builds.apache.org/job/hadoop-multibranch/job/PR-706/1/artifact/out/patch-unit-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-server_hadoop-yarn-server-resourcemanager.txt
Test Results	https://builds.apache.org/job/hadoop-multibranch/job/PR-706/1/testReport/
asflicense	https://builds.apache.org/job/hadoop-multibranch/job/PR-706/1/artifact/out/patch-asflicense-problems.txt
Max. process+thread count	925 (vs. ulimit of 5500)
modules	C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager U: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-706/1/console
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[hextriclosan]

test4tests: unused code deleted no reason to add/delete unit any tests
findbugs: 2 warnings aren't related to code changes
unit: failures aren't caused by the fix
asflicense: license warning is about of absence of license header but modified file has the license header

[aajisaka]

+1

[aajisaka]

Committed to trunk. Thank you @hextriclosan