HADOOP-17819. Add extensions to ProtobufRpcEngine RequestHeaderProto

[hchaverri]

NOTICE

Please create an issue in ASF JIRA before opening a pull request,
and you need to set the title of the pull request which starts with
the corresponding JIRA issue number. (e.g. HADOOP-XXXXX. Fix a typo in YYY.)
For more details, please see https://cwiki.apache.org/confluence/display/HADOOP/How+To+Contribute

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 57s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 1s		No case conflicting files found.
+0 🆗	buf	0m 0s		buf was not available.
+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	37m 38s		trunk passed
+1 💚	compile	29m 59s		trunk passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	compile	24m 6s		trunk passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	mvnsite	1m 53s		trunk passed
+1 💚	shadedclient	112m 29s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 13s		the patch passed
+1 💚	compile	28m 17s		the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
-1 ❌	cc	28m 17s	/results-compile-cc-root-jdkUbuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04.txt	root-jdkUbuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 generated 39 new + 284 unchanged - 39 fixed = 323 total (was 323)
+1 💚	javac	28m 17s		the patch passed
+1 💚	compile	19m 56s		the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
-1 ❌	cc	19m 56s	/results-compile-cc-root-jdkPrivateBuild-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10.txt	root-jdkPrivateBuild-1.8.0_292-8u292-b10-0ubuntu120.04-b10 with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu120.04-b10 generated 31 new + 292 unchanged - 31 fixed = 323 total (was 323)
+1 💚	javac	19m 56s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	1m 40s		the patch passed
+1 💚	shadedclient	15m 25s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	17m 3s		hadoop-common in the patch passed.
+1 💚	asflicense	0m 59s		The patch does not generate ASF License warnings.
		198m 33s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3242/1/artifact/out/Dockerfile
GITHUB PR	#3242
Optional Tests	dupname asflicense compile cc mvnsite javac unit buflint bufcompat codespell
uname	Linux 3059cee291d7 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 0b539b1
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-3242/1/testReport/
Max. process+thread count	2781 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3242/1/console
versions	git=2.25.1 maven=3.6.3
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[shvachko]

+1 Will be committing this shortly