vchoi_fork

[svn-r2562] Purpose:
     Added test program to verify the Stream Virtual File Driver.

Description:
    This program tests the functionality of the Stream Virtual File Driver.

      1. It spawns two new processes, a sender and a receiver.
      2. The sender opens an HDF5 file for writing and writes
         a sample dataset to it.
         On closing the file the Stream VFD would send the file
         contents to any connected client.
      3. The receiver serves as a client attempting to open an
         HDF5 file for reading. On opening the file the Stream VFD
         would establish a socket connection to the sender process,
         identified by its hostname (which is localhost in this example)
         and a port number, and read the file contents via this socket.
         Aftwerwards the dataset is read from the file into memory
         and verified.
      4. The main program waits for termination of its two child
         processes and returns their exit code.

Platforms:
     Tested so far under Linux, Irix 32/64bit, OSF1, Solaris, Cray Unicos,
     Hitachi SR8000, IBM AIX.
     Not tested under Windows yet.