Import test data.

  >>> import os
  >>> from subprocess import call
  >>> testldif = os.environ.get('TESTLDIF')
  >>> ldapaddbin = os.environ.get('LDAPADDBIN')
  
  >>> binddn = "cn=Manager,dc=my-domain,dc=com"
  >>> bindpw = "secret"
  >>> cmd = [ldapaddbin, '-f', testldif, '-x', '-D',
  ...        '%s' % binddn, '-w', bindpw, '-c', '-a', 
  ...        '-p', '12345', '-h', '127.0.0.1']
  >>> retcode = call(cmd)