Revert "Add missing license headers"

This reverts commit ffd92ddf3507c0b5ca28cc9ca31c2434bd077ae3.
Revert "SONAR-3979, SONAR-4047 Fix Sonar Maven goal to support Maven 3.1"

This reverts commit ceaddeb0db54d29fd67d11f23488f61f85041446.