Make java benchmarks runnable out of the box again

Added missing bench.jar file back to the image.
Fixed an obsolete description in the README file.

Signed-off-by: Tomasz Grabiec <tgrabiec@cloudius-systems.com>

README

@@ -205,10 +205,8 @@ Running java benchmarks
 =======================
 
 After running "make", do
-    scripts/imgedit.py setargs build/debug/loader.img java.so -jar bench.jar
-
-and then run normally (./scripts/run.py).
 
+    ./scripts/run.py -e "java.so -jar /tests/bench/bench.jar"
 
 Profiling
 =========

bootfs.manifest

@@ -59,6 +59,7 @@
 /&/tests/tst-dns-resolver.so: ./&
 /&/tests/tst-fs-link.so: ./&
 /&/tests/tst-kill.so: ./&
+/&/tests/bench/bench.jar: ./&
 /testrunner.so: ./tests/testrunner.so
 /java/Hello.class: ./tests/hello/Hello.class
 /java.so: java/java.so