HDDS-6107. Exclude hugo lock file from source tarball

[adoroszlai]

What changes were proposed in this pull request?

Hugo 0.89:

Hugo now writes an empty file named .hugo_build.lock to the root of the project when building

We should exclude this lock file from the source tarball of releases.

$ mvn -DskipTests -Psrc clean package
$ tar tzvf hadoop-ozone/dist/target/ozone-1.3.0-SNAPSHOT-src.tar.gz | grep hugo | wc -l
       1

https://issues.apache.org/jira/browse/HDDS-6107

How was this patch tested?

$ mvn -DskipTests -Psrc clean package
$ tar tzvf hadoop-ozone/dist/target/ozone-1.3.0-SNAPSHOT-src.tar.gz | grep hugo | wc -l
       0

[errose28]

Thanks for the quick fix @adoroszlai. I verified with mvn clean install -Dmaven.javadoc.skip=true -DskipTests -Pdist,src -Dtar that the hugo lock file was not present in the output source tarball.

[adoroszlai]

Thanks @errose28 for reviewing and committing it.