java: Don't throw exceptions at user when the main class is not found

Fixes https://github.com/cloudius-systems/mgmt/issues/33

If a user runs 'java xyz', instead of throwing the stacktrace, a simple
message informing the user about the missing class, should suffice.

Signed-off-by: Jaspal Singh Dhillon <jaspal.iiith@gmail.com>
Reviewed-by: Tomasz Grabiec <tgrabiec@gmail.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>