make sure permissions are set after build

Previously the build commands changed the directory back to root:root after building and copying. This meant that when kafka started it was unable to create a logs file in the install directory. Kafka would start but it would fail to really be healthy because it wasn't able to write/create that directory. Also, the sym-linked directory would also be root:root compounding the issue. This makes sure that the kafka install directory is able to be managed by the kafka user.