[MXNET-1331] Removal of non-MXNET classes from JAR

[jessr92]

Consumers of MXNet are exposed to the library versions MXNet uses internally. This change excludes those JARs from the JARs created with make scalapkg.

Description

This PR removes 3rd party libraries from the assembled JAR and adds both packages as dependencies in deploy.xml

Checklist

Essentials

Please feel free to remove inapplicable items for your PR.

• The PR title starts with [MXNET-$JIRA_ID], where $JIRA_ID refers to the relevant JIRA issue created (except PRs with tiny changes)
• Changes are complete (i.e. I finished coding on this PR)
• To the my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change

Changes

• slf4j-api and args4j remove from assembled JAR
• slf4j-api and args4j added as dependencies to deploy.xml

Comments

My Maven knowledge is sparse so I may have missed something.

For testing:

• The JAR no longer contains non-org.apache.mxnetclasses
• make scalapkg && make scalaunittests && make scalaintegrationtests passed on my Ubuntu 18.04 machine (JDK 8).

Related to #14000

[jessr92]

@mxnet-label-bot update [Scala, Maven, pr-awaiting-review]

[ChaiBapchya]

Thanks for your contribution. CI bug - Can you please retrigger by pushing empty commit

git commit --allow-empty -m "Trigger notification"

[jessr92]

Thanks. All looks well now.