HADOOP-17614. Bump netty to the latest 4.1.61.

[jojochuang]

No description provided.

[jojochuang]

This is the branch-3.1 version. Note that the structural change inside hadoop-project/pom.xml between branch-3.1 and branch-3.2 was quite substantial.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	9m 52s		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.
			_ branch-3.1 Compile Tests _
+1 💚	mvninstall	26m 55s		branch-3.1 passed
+1 💚	compile	0m 19s		branch-3.1 passed
+1 💚	mvnsite	0m 22s		branch-3.1 passed
+1 💚	javadoc	0m 21s		branch-3.1 passed
+1 💚	shadedclient	40m 8s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 14s		the patch passed
+1 💚	compile	0m 12s		the patch passed
+1 💚	javac	0m 12s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	0m 14s		the patch passed
+1 💚	xml	0m 2s		The patch has no ill-formed XML file.
+1 💚	javadoc	0m 13s		the patch passed
+1 💚	shadedclient	13m 55s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	0m 16s		hadoop-project in the patch passed.
+1 💚	asflicense	0m 30s		The patch does not generate ASF License warnings.
		67m 14s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2871/1/artifact/out/Dockerfile
GITHUB PR	#2871
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient codespell xml
uname	Linux 62ca30c3b7d3 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	branch-3.1 / 9a5637b
Default Java	Private Build-1.8.0_282-8u282-b08-0ubuntu1~18.04-b08
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2871/1/testReport/
Max. process+thread count	421 (vs. ulimit of 5500)
modules	C: hadoop-project U: hadoop-project
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2871/1/console
versions	git=2.17.1 maven=3.6.0
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[jojochuang]

I'll merge later today if no objects.