fixup! web_shadir: PY3 compatibility

bt5/erp5_web_shadir/TestTemplateItem/portal_components/test.erp5.ShaDirMixin.py

@@ -44,7 +44,6 @@ class ShaDirMixin(object):
       Initialize the ERP5 site.
     """
     self.login()
-    self.portal = self.getPortal()
 
     self.key = 'mykey' + str(random.random())
     self.file_content = b'This is the content.'
@@ -64,7 +63,7 @@ class ShaDirMixin(object):
                       'architecture': self.architecture}),
                       b64encode(b"User SIGNATURE goes here.").decode()]
 
-    self.data = json.dumps(self.data_list)
+    self.data = json.dumps(self.data_list).encode()
     self.sha512sum = hashlib.sha512(self.data).hexdigest()
 
     self.header_dict = {