Use junit system-rules dependency with test scope

Author: elek

util/pom.xml

@@ -62,6 +62,7 @@
             <groupId>com.github.stefanbirkner</groupId>
             <artifactId>system-rules</artifactId>
             <version>1.16.1</version>
+            <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>com.google.protobuf</groupId>