java: put jar files in classpath (/java)

bootfs.manifest

@@ -43,8 +43,8 @@
 /java/Hello.class: ./tests/hello/Hello.class
 /java.so: java/java.so
 /java/RunJar.class: java/RunJar.class
-/bench.jar: tests/bench/bench.jar
-/cloudius.jar: java/cloudius.jar
+/java/bench.jar: tests/bench/bench.jar
+/java/cloudius.jar: java/cloudius.jar
 /usr/lib/jni/balloon.so: java/jni/balloon.so
 /console/util.js: ../../console/util.js
 /console/autocomplete.js: ../../console/autocomplete.js