HADOOP-18090 Exclude com/jcraft/jsch classes from being shaded/relocated

[tiki-sk]

Description of PR

Spark 3.2.0 transitively introduces hadoop-client-api and hadoop-client-runtime dependencies.

When we create a SFTPFileSystem instance (org.apache.hadoop.fs.sftp.SFTPFileSystem) it tries to load the relocated classes from com.jcraft.jsch package.

The filesystem instance creation fails with error:

java.lang.ClassNotFoundException: org.apache.hadoop.shaded.com.jcraft.jsch.SftpException
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) 

How was this patch tested?

For code changes:

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 36s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+0 🆗	detsecrets	0m 1s		detect-secrets was not available.
+0 🆗	xmllint	0m 1s		xmllint 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 14s		Maven dependency ordering for branch
+1 💚	mvninstall	25m 38s		trunk passed
+1 💚	compile	0m 42s		trunk passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	compile	0m 42s		trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	mvnsite	1m 26s		trunk passed
+1 💚	javadoc	1m 27s		trunk passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javadoc	1m 22s		trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	shadedclient	66m 31s		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	7m 48s		the patch passed
+1 💚	compile	0m 24s		the patch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javac	0m 24s		the patch passed
+1 💚	compile	0m 24s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	javac	0m 24s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	0m 48s		the patch passed
+1 💚	javadoc	0m 46s		the patch passed with JDK Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1
+1 💚	javadoc	0m 46s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	shadedclient	23m 4s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	0m 32s		hadoop-client-runtime in the patch passed.
+1 💚	unit	0m 31s		hadoop-client-minicluster in the patch passed.
+1 💚	asflicense	0m 49s		The patch does not generate ASF License warnings.
		103m 11s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4700/1/artifact/out/Dockerfile
GITHUB PR	#4700
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient codespell detsecrets xmllint
uname	Linux 8e3c06b6c628 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 / 7eb73fe
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-4700/1/testReport/
Max. process+thread count	683 (vs. ulimit of 5500)
modules	C: hadoop-client-modules/hadoop-client-runtime hadoop-client-modules/hadoop-client-minicluster U: hadoop-client-modules
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4700/1/console
versions	git=2.25.1 maven=3.6.3
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