code generator generates some files to non-standard maven paths

SPIs are generated to target/generated-resources (/META-INF/services).

Yang files are copied to target/yang and this folder is marked as sources root that should be mapped to MEATA-INF during plugin lifecycle. This makes it impossible for IDEs to pick up those files, as the only standard folder is target/generated-sources/*

This setup makes it thus hard to run tests without switching off projects from current workspace.y