tests: update http requests mocking to use bytes (#36515)

tests/utilities.py

@@ -14,7 +14,7 @@ from wcs import sql, sessions
 from webtest import TestApp
 from quixote import cleanup, get_publisher
 from django.conf import settings
-from django.utils.encoding import force_text
+from django.utils.encoding import force_bytes, force_text
 from django.utils.six.moves.urllib import parse as urlparse
 
 from wcs.qommon import force_str
@@ -338,6 +338,8 @@ class HttpRequestsMocking(object):
             except IOError:
                 status = 404
 
+        data = force_bytes(data)
+
         class FakeResponse(object):
             def __init__(self, status, data, headers):
                 self.status_code = status