Ongoing improvements in java fuzz testing

Added --device option to runner to define target in case
        multiple devices are attached

Added more cases to JavaFuzz, removed a few cases that
are likely to hang the program (such as changing loop
variables) since throughput is more important for fuzzing

Test: run_java_fuzz_test.py

BUG=30610121

Change-Id: I0cd6f5d3b7fb35ddb91d91c0c0c00afaf83218d8