HDDS-1756. DeleteContainerCommandHandler fails with NPE.

[nandakumar131]

This change will make delete container an idempotent operation in datanode.

[mukul1987]

+1, the changes look good to me. pending jenkins.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	38	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	489	trunk passed
+1	compile	240	trunk passed
+1	checkstyle	64	trunk passed
+1	mvnsite	0	trunk passed
+1	shadedclient	818	branch has no errors when building and testing our client artifacts.
+1	javadoc	153	trunk passed
0	spotbugs	310	Used deprecated FindBugs config; considering switching to SpotBugs.
+1	findbugs	505	trunk passed
		_ Patch Compile Tests _
+1	mvninstall	426	the patch passed
+1	compile	255	the patch passed
+1	javac	255	the patch passed
+1	checkstyle	72	the patch passed
+1	mvnsite	0	the patch passed
+1	whitespace	0	The patch has no whitespace issues.
+1	shadedclient	640	patch has no errors when building and testing our client artifacts.
+1	javadoc	147	the patch passed
-1	findbugs	166	hadoop-ozone in the patch failed.
		_ Other Tests _
-1	unit	54	hadoop-hdds in the patch failed.
-1	unit	34	hadoop-ozone in the patch failed.
0	asflicense	39	ASF License check generated no output?
		4494

Subsystem	Report/Notes
Docker	Client=18.09.7 Server=18.09.7 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1095/1/artifact/out/Dockerfile
GITHUB PR	#1095
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle
uname	Linux 508bbfce471f 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 / 5446308
Default Java	1.8.0_212
findbugs	https://builds.apache.org/job/hadoop-multibranch/job/PR-1095/1/artifact/out/patch-findbugs-hadoop-ozone.txt
unit	https://builds.apache.org/job/hadoop-multibranch/job/PR-1095/1/artifact/out/patch-unit-hadoop-hdds.txt
unit	https://builds.apache.org/job/hadoop-multibranch/job/PR-1095/1/artifact/out/patch-unit-hadoop-ozone.txt
Test Results	https://builds.apache.org/job/hadoop-multibranch/job/PR-1095/1/testReport/
Max. process+thread count	412 (vs. ulimit of 5500)
modules	C: hadoop-hdds/container-service U: hadoop-hdds/container-service
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-1095/1/console
versions	git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1
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