Skip analyzing private dependencies in maven projects

[yff-java]

Skip analyzing private packages in maven projects so that cdxgen can do subsequent analysis. The log info is as follow:

Resolve the above maven error. This could be due to the following:

1. Try building the project with 'mvn package -Dmaven.test.skip=true' using the correct version of Java and maven before invoking cdxgen.
2. Private dependencies cannot be downloaded: Check if any additional arguments must be passed to maven and set them via MVN_ARGS environment variable.
3. Check if all required environment variables including any maven profile arguments are passed correctly to this tool.