Add test for relocatable rpm behaviour
Add test for relocatable rpm behaviour

This test asserts the behaviour added by https://github.com/sbt/sbt-native-packager/pull/661

Sciss/sbt-native-packager,Sciss/sbt-native-packager,Sciss/sbt-native-packager,fsat/sbt-native-packager,schon/sbt-native-packager,sbt/sbt-native-packager,fsat/sbt-native-packager,Sciss/sbt-native-packager,schon/sbt-native-packager,giabao/sbt-native-packager,fsat/sbt-native-packager,kardapoltsev/sbt-native-packager,kodemaniak/sbt-native-packager,kodemaniak/sbt-native-packager,giabao/sbt-native-packager,kodemaniak/sbt-native-packager,kodemaniak/sbt-native-packager,kardapoltsev/sbt-native-packager,Sciss/sbt-native-packager,fsat/sbt-native-packager,fsat/sbt-native-packager,fsat/sbt-native-packager,kardapoltsev/sbt-native-packager,sbt/sbt-native-packager,schon/sbt-native-packager,sbt/sbt-native-packager,kodemaniak/sbt-native-packager,sbt/sbt-native-packager,giabao/sbt-native-packager,kodemaniak/sbt-native-packager,sbt/sbt-native-packager,kardapoltsev/sbt-native-packager,schon/sbt-native-packager,kardapoltsev/sbt-native-packager,kardapoltsev/sbt-native-packager,kardapoltsev/sbt-native-packager,sbt/sbt-native-packager,Sciss/sbt-native-packager,giabao/sbt-native-packager,schon/sbt-native-packager,giabao/sbt-native-packager,Sciss/sbt-native-packager