reduce the verbosity

Running tests is now done by editing the command line in build.mak

and verify their content. The image is been run over but the content
is restored after each write

With virtio we must use dynamic allocation for the correctness of
virt_to_phys

The tests themselves didn't change and all the changes their are just
changes of namespace usage and variable movement.

the vtest class) and running them one after the other.
It moves the test code outside of loader.cc

Run 2 threads, one allocated mem, the other deletes the allocation.

osv:
     147 NanoTime
     574 context switch

fedora:
     322 NanoTime
    2484 context switch

(nanoseconds, on kvm, on my laptop)

One test so far: java.lang.System.nanoTime()

We're only about 500% slower than native.

Style requires manual edititing of loader.cc to run, no automated way
to pick up whole directories in the manifest, and we won't clear the
environment before running the next .so

Various changes to fit into the OSv environment.  This also includes
a ramfs in-memory full filesystem.  Bootfs is rewritten as a simple
unpacker into ramfs, and the fs class is modified to wrap the VFS
instead of being an abstract subclass.