tests: remove pointless virconftest.sh wrapper
    
    The virconftest is different from all our other tests in that
    the C program only tests a single in/out config file pair. It
    relies on a shell wrapper to invoke it once for each test
    file.
    
    This gets rid of the shell wrapper and makes the C program
    actually run over each test file using the normal test pattern.
    
    Signed-off-by: Daniel P. Berrange <berrange@redhat.com>