update fedoral base image to 43 and related tests

Signed-off-by: Tim Zhou <tizhou@redhat.com>
(cherry picked from commit 5d79adbd6a)
Signed-off-by: Paul Holzinger <pholzing@redhat.com>

test/apiv2/python/rest_api/test_v2_0_0_image.py

@@ -1,6 +1,6 @@
 import json
 import unittest
-from multiprocessing import Process
+import multiprocessing as mp
 
 import requests
 from dateutil.parser import parse
@@ -168,9 +168,12 @@ class ImageTestCase(APITestCase):
             self.assertEqual(r.status_code, 400, f"#5: {r.text}")
 
         i = 1
+        # Need to explicitly set start method
+        # # https://docs.python.org/dev/library/multiprocessing.html#contexts-and-start-methods
+        mp.set_start_method('fork')
         for fn in [do_search1, do_search2, do_search3, do_search4, do_search5]:
             with self.subTest(i=i):
-                search = Process(target=fn)
+                search = mp.Process(target=fn)
                 search.start()
                 search.join(timeout=10)
                 self.assertFalse(search.is_alive(), f"#{i} /images/search took too long")