Allow multiple jars to be used for fuzz target classpath

Previously the first argument had to be a single jar with all the application classes,
now we allow to specify multiple jars that are separted with pathSeparator.

fuzz/src/main/java/edu/berkeley/cs/jqf/fuzz/ei/ZestCLI.java

@@ -134,7 +134,7 @@ public void run() {
 
         try {
             ClassLoader loader = new InstrumentingClassLoader(
-                    new String[]{System.getProperty("java.class.path"), this.testPackageName},
+                    this.testPackageName.split(File.pathSeparator),
                     ZestCLI.class.getClassLoader());
 
             // Load the guidance