FIX: new systems expect encoded body

Summary

So far the MockupResponse always returned a str. On new systems however it is expected that the return value is bytes. When debug=1 is enabled for the Container on a new OS, the MockupResponse return value thus results in an error.

Focus

See for example _log_response in model.py.

I also changed unittests accordingly.

Note

What is the python version corresponding to 0x03000000? Can we drop this condition entirely?

Test Environment

Run advancedtools unittests with debug=1.

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src/caosdb/connection/mockup.py

@@ -26,6 +26,7 @@ up a tcp connection."""
 
 from __future__ import unicode_literals, print_function
 from io import StringIO
+from sys import hexversion
 from .connection import CaosDBServerConnection, CaosDBHTTPResponse
 
 
@@ -56,7 +57,10 @@ class MockUpResponse(CaosDBHTTPResponse):
 
     def read(self, size=-1):
         """Return the body of the response."""
-        return self.response.read(size)
+        if hexversion < 0x03000000:
+            return self.response.read(size)
+        else:
+            return self.response.read(size).encode()
 
     def getheader(self, name, default=None):
         """Get the contents of the header `name`, or `default` if there is no