DRILL-6925: Unable to generate Protobuf
- use ${maven.multiModuleProjectDirectory}/header to find header file from any submodule
- suppress UnresolvedMavenProperty, since IDE expects that property should be set explicitly
- update "kr.motd.maven:os-maven-plugin" github.com/trustin/os-maven-plugin to the latest 1.6.1 version
- correction of ${user.name} propery for "maven-jar-plugin" <Built-By>
- update "apache-rat-plugin" to solve undefined "excludeSubprojects" in IDE
- regenerate Java and C++ protobuf files
closes #1585
