HDFS-14686. HttpFS: HttpFSFileSystem#getErasureCodingPolicy always returns null

[smengcl]

Modified existing unit test to verify the validity of the fix. Without the fix, the modified unit test WILL fail. Tested locally.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	138	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 appears to include 1 new or modified test files.
		_ trunk Compile Tests _
0	mvndep	12	Maven dependency ordering for branch
+1	mvninstall	1221	trunk passed
+1	compile	207	trunk passed
+1	checkstyle	55	trunk passed
+1	mvnsite	86	trunk passed
+1	shadedclient	870	branch has no errors when building and testing our client artifacts.
+1	javadoc	53	trunk passed
0	spotbugs	43	Used deprecated FindBugs config; considering switching to SpotBugs.
+1	findbugs	179	trunk passed
		_ Patch Compile Tests _
0	mvndep	12	Maven dependency ordering for patch
+1	mvninstall	73	the patch passed
+1	compile	215	the patch passed
+1	javac	215	the patch passed
+1	checkstyle	54	the patch passed
+1	mvnsite	84	the patch passed
+1	whitespace	0	The patch has no whitespace issues.
+1	shadedclient	807	patch has no errors when building and testing our client artifacts.
+1	javadoc	51	the patch passed
+1	findbugs	193	the patch passed
		_ Other Tests _
+1	unit	118	hadoop-hdfs-client in the patch passed.
+1	unit	281	hadoop-hdfs-httpfs in the patch passed.
+1	asflicense	30	The patch does not generate ASF License warnings.
		4786

Subsystem	Report/Notes
Docker	Client=19.03.1 Server=19.03.1 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1192/1/artifact/out/Dockerfile
GITHUB PR	#1192
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle
uname	Linux 23fe57df28d3 4.15.0-52-generic #56-Ubuntu SMP Tue Jun 4 22:49:08 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/hadoop.sh
git revision	trunk / f86de6f
Default Java	1.8.0_222
Test Results	https://builds.apache.org/job/hadoop-multibranch/job/PR-1192/1/testReport/
Max. process+thread count	609 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-client hadoop-hdfs-project/hadoop-hdfs-httpfs U: hadoop-hdfs-project
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-1192/1/console
versions	git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1
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[jojochuang]

LGTM