Mirror the jre file layout closely, otherwise it gets confused.

Add a new hello_world test payload that can be used to test OSv functionality
more fine grained.  For now the binary loaded remains hardcoded in loader.cc
and still defaults to libjvm.so.

Change the directory structure a little to conform with jvm expecations
(removing server/ from libjvm.so).

Don't load it from the glibc library.