HDFS-16716. Improve appendToFile command: support appending on file w…

[ghost]

HDFS client DistributedFileSystem#append supports appending to a file with optional create flags.

However, appendToFile command only supports the default create flag APPEND so that append on EC file without NEW_BLOCK create flag is not supported.

Thus, it's necessary to improve appendToFile command by adding option -n for it. Option -n represents that use NEW_BLOCK create flag while appending file.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 52s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets 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 _
+0 🆗	mvndep	15m 6s		Maven dependency ordering for branch
-1 ❌	mvninstall	7m 43s	/branch-mvninstall-root.txt	root in trunk failed.
+1 💚	compile	23m 23s		trunk passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	compile	21m 20s		trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	checkstyle	4m 18s		trunk passed
+1 💚	mvnsite	3m 56s		trunk passed
+1 💚	javadoc	3m 5s		trunk passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javadoc	2m 29s		trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	spotbugs	6m 16s		trunk passed
+1 💚	shadedclient	23m 47s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 33s		Maven dependency ordering for patch
+1 💚	mvninstall	2m 3s		the patch passed
+1 💚	compile	24m 48s		the patch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javac	24m 48s		the patch passed
+1 💚	compile	22m 17s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	javac	22m 17s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	4m 24s	/results-checkstyle-root.txt	root: The patch generated 6 new + 92 unchanged - 0 fixed = 98 total (was 92)
+1 💚	mvnsite	3m 50s		the patch passed
-1 ❌	javadoc	1m 37s	/results-javadoc-javadoc-hadoop-common-project_hadoop-common-jdkPrivateBuild-11.0.15+10-Ubuntu-0ubuntu0.20.04.1.txt	hadoop-common-project_hadoop-common-jdkPrivateBuild-11.0.15+10-Ubuntu-0ubuntu0.20.04.1 with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1 generated 2 new + 0 unchanged - 0 fixed = 2 total (was 0)
+1 💚	javadoc	2m 23s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	spotbugs	6m 51s		the patch passed
+1 💚	shadedclient	26m 16s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
-1 ❌	unit	19m 6s	/patch-unit-hadoop-common-project_hadoop-common.txt	hadoop-common in the patch passed.
+1 💚	unit	2m 55s		hadoop-hdfs-client in the patch passed.
+1 💚	asflicense	1m 12s		The patch does not generate ASF License warnings.
		233m 25s

Reason	Tests
Failed junit tests	hadoop.fs.TestHarFileSystem
	hadoop.fs.TestFilterFileSystem

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4696/1/artifact/out/Dockerfile
GITHUB PR	#4696
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 8a85f4794c2a 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 / caa3fb8
Default Java	Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4696/1/testReport/
Max. process+thread count	3032 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common hadoop-hdfs-project/hadoop-hdfs-client U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4696/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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