HDDS-1761. Fix class hierarchy for KeyRequest and FileRequest classes.

[bharatviswa504]

No description provided.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	31	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 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	517	trunk passed
+1	compile	262	trunk passed
+1	checkstyle	64	trunk passed
+1	mvnsite	0	trunk passed
+1	shadedclient	836	branch has no errors when building and testing our client artifacts.
+1	javadoc	145	trunk passed
0	spotbugs	353	Used deprecated FindBugs config; considering switching to SpotBugs.
+1	findbugs	554	trunk passed
		_ Patch Compile Tests _
+1	mvninstall	461	the patch passed
+1	compile	275	the patch passed
+1	javac	275	the patch passed
+1	checkstyle	68	the patch passed
+1	mvnsite	0	the patch passed
+1	whitespace	0	The patch has no whitespace issues.
+1	shadedclient	654	patch has no errors when building and testing our client artifacts.
+1	javadoc	157	the patch passed
+1	findbugs	567	the patch passed
		_ Other Tests _
+1	unit	253	hadoop-hdds in the patch passed.
-1	unit	2232	hadoop-ozone in the patch failed.
+1	asflicense	51	The patch does not generate ASF License warnings.
		7286

Reason	Tests
Failed junit tests	hadoop.ozone.om.TestOzoneManagerHA
	hadoop.ozone.scm.node.TestQueryNode
	hadoop.ozone.TestStorageContainerManager
	hadoop.hdds.scm.pipeline.TestSCMPipelineManager
	hadoop.ozone.container.common.statemachine.commandhandler.TestBlockDeletion

Subsystem	Report/Notes
Docker	Client=17.05.0-ce Server=17.05.0-ce base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1052/1/artifact/out/Dockerfile
GITHUB PR	#1052
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle
uname	Linux a601e36bba90 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 / 8965ddc
Default Java	1.8.0_212
unit	https://builds.apache.org/job/hadoop-multibranch/job/PR-1052/1/artifact/out/patch-unit-hadoop-ozone.txt
Test Results	https://builds.apache.org/job/hadoop-multibranch/job/PR-1052/1/testReport/
Max. process+thread count	4515 (vs. ulimit of 5500)
modules	C: hadoop-ozone/ozone-manager U: hadoop-ozone/ozone-manager
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-1052/1/console
versions	git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1
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[arp7]

LGTM.

[bharatviswa504]

Thank You @arp7 for the review.
Test failures are not related to this patch. Will commit this to the trunk.