TEZ-3322: Add Apache license to the generated tez-configuration-template files

[abstractdog]

tested:
built tez-javadoc-tools procject

cd tez-runtime-library
mvn site

checked ./target/site/apidocs/configs/tez-runtime-default-template.xml

[abstractdog]

I just picked this up while creating tez 0.10.2, can you please review @sidseth ?

[tez-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 28s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+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.
		_ master Compile Tests _
+1 💚	mvninstall	15m 48s	master passed
+1 💚	compile	0m 44s	master passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	compile	0m 43s	master passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	checkstyle	1m 19s	master passed
+1 💚	javadoc	0m 56s	master passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javadoc	0m 41s	master passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+0 🆗	spotbugs	1m 17s	Used deprecated FindBugs config; considering switching to SpotBugs.
+1 💚	findbugs	1m 15s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	0m 15s	the patch passed
+1 💚	compile	0m 15s	the patch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javac	0m 15s	the patch passed
+1 💚	compile	0m 13s	the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	javac	0m 13s	the patch passed
-0 ⚠️	checkstyle	0m 10s	tez-tools/tez-javadoc-tools: The patch generated 1 new + 0 unchanged - 1 fixed = 1 total (was 1)
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	javadoc	0m 13s	the patch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javadoc	0m 12s	the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	findbugs	0m 29s	the patch passed
		_ Other Tests _
+1 💚	unit	0m 14s	tez-javadoc-tools in the patch passed.
+1 💚	asflicense	0m 17s	The patch does not generate ASF License warnings.
		25m 13s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-230/2/artifact/out/Dockerfile
GITHUB PR	#230
JIRA Issue	TEZ-3322
Optional Tests	dupname asflicense javac javadoc unit spotbugs findbugs checkstyle compile
uname	Linux 0ac630e8179a 4.15.0-156-generic #163-Ubuntu SMP Thu Aug 19 23:31:58 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/tez.sh
git revision	master / a192ec4
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
checkstyle	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-230/2/artifact/out/diff-checkstyle-tez-tools_tez-javadoc-tools.txt
Test Results	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-230/2/testReport/
Max. process+thread count	95 (vs. ulimit of 5500)
modules	C: tez-tools/tez-javadoc-tools U: tez-tools/tez-javadoc-tools
Console output	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-230/2/console
versions	git=2.25.1 maven=3.6.3 findbugs=3.0.1
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[ayushtkn]

LGTM

[abstractdog]

thanks @ayushtkn for the review!
can you take a look at this @rbalamohan , @sidseth please?