[701] Handle multiple LICENSE file generation

[piyushdubey]

Important Read

Issue - #701

What is the purpose of the pull request

This Pull Request addresses the issue with creating multiple LICENSE and NOTICE files

Brief change log

Fixed multiple LICENSE file copying

Verify this pull request

This pull request is a trivial rework / code cleanup without any test coverage.

Ran the following command to verify that no LICENSE-bundled or NOTICE-bundled files are copied/generated anymore.

Command

for i in *.jar; do echo "$i"; jar tf "$i" | grep LICENSE; done

Result

xtable-aws-0.3.0-incubating.jar
META-INF/LICENSE
META-INF/licenses/LICENSE-antlr4-runtime
META-INF/licenses/LICENSE-checker-qual
META-INF/licenses/LICENSE-glassfish-java-servlet-jsp
META-INF/licenses/LICENSE-javax-annotation-api
META-INF/licenses/LICENSE-paranamer
META-INF/licenses/LICENSE-slf4j-api