Do not log binary data during debug

Do not log binary data during debug logging of a session.
Replace the binary data with the string <binary_data> instead.

Change-Id: I5184002f3a21c5e0ee510b21b9a7884c8dccd1e3

keystoneauth1/session.py

@@ -202,6 +202,11 @@ class Session(object):
         if json:
             data = self._json.encode(json)
         if data:
+            if isinstance(data, six.binary_type):
+                try:
+                    data = data.decode("ascii")
+                except UnicodeDecodeError:
+                    data = "<binary_data>"
             string_parts.append("-d '%s'" % data)
 
         logger.debug(' '.join(string_parts))