HDFS-16294.Remove invalid DataNode#CONFIG_PROPERTY_SIMULATED.

[jianghuazhu]

Description of PR

As early as when HDFS-2907 was resolved, SimulatedFSDataset#CONFIG_PROPERTY_SIMULATED was removed. Replaced by: SimulatedFSDataset#Factory and DFSConfigKyes#DFS_DATANODE_FSDATASET_FACTORY_KEY.
However, the introduction to CONFIG_PROPERTY_SIMULATED is still retained in the DataNode.
Details: HDFS-16294

How was this patch tested?

This pr mainly solves the changes related to annotations, and the test pressure is not great.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 38s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
-1 ❌	test4tests	0m 0s		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	31m 57s		trunk passed
+1 💚	compile	1m 23s		trunk passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	compile	1m 16s		trunk passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	checkstyle	1m 0s		trunk passed
+1 💚	mvnsite	1m 23s		trunk passed
+1 💚	javadoc	0m 58s		trunk passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javadoc	1m 24s		trunk passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	spotbugs	3m 6s		trunk passed
+1 💚	shadedclient	22m 4s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 11s		the patch passed
+1 💚	compile	1m 13s		the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javac	1m 13s		the patch passed
+1 💚	compile	1m 5s		the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	javac	1m 5s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 50s		the patch passed
+1 💚	mvnsite	1m 12s		the patch passed
+1 💚	javadoc	0m 45s		the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javadoc	1m 21s		the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	spotbugs	3m 6s		the patch passed
+1 💚	shadedclient	21m 43s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	223m 16s		hadoop-hdfs in the patch passed.
+1 💚	asflicense	0m 46s		The patch does not generate ASF License warnings.
		319m 45s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3605/1/artifact/out/Dockerfile
GITHUB PR	#3605
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell
uname	Linux e0355e340cb5 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / d46bd52
Default Java	Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3605/1/testReport/
Max. process+thread count	3390 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3605/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[jianghuazhu]

It seems that Jenkins did not execute successfully, It seems that these have little to do with the code I submitted.
@tasanuma @prasad-acit @tomscut, you are willing to spend some time reviewing this PR.
Thank you very much.

[tasanuma]

LGTM. I don't think the unit test is required, so the result of Jenkins is not a problem.

[tasanuma]

@jianghuazhu Thanks for your contribution.

[jianghuazhu]

Thank you very much. @tasanuma