Adds various fixes for bigip_config tests (#33470)

There were upstream changes that were incompatible with the downstream
code. This fixes those.

test/units/modules/network/f5/test_bigip_config.py

@@ -15,21 +15,23 @@ if sys.version_info < (2, 7):
     raise SkipTest("F5 Ansible modules require Python >= 2.7")
 
 from ansible.compat.tests import unittest
-from ansible.compat.tests.mock import patch, Mock
+from ansible.compat.tests.mock import Mock
+from ansible.compat.tests.mock import patch
 from ansible.module_utils.f5_utils import AnsibleF5Client
-from units.modules.utils import set_module_args
 
 try:
     from library.bigip_config import Parameters
     from library.bigip_config import ModuleManager
     from library.bigip_config import ArgumentSpec
     from ansible.module_utils.f5_utils import iControlUnexpectedHTTPError
+    from test.unit.modules.utils import set_module_args
 except ImportError:
     try:
         from ansible.modules.network.f5.bigip_config import Parameters
         from ansible.modules.network.f5.bigip_config import ModuleManager
         from ansible.modules.network.f5.bigip_config import ArgumentSpec
         from ansible.module_utils.f5_utils import iControlUnexpectedHTTPError
+        from units.modules.utils import set_module_args
     except ImportError:
         raise SkipTest("F5 Ansible modules require the f5-sdk Python library")
 
@@ -39,12 +41,19 @@ fixture_data = {}
 
 def load_fixture(name):
     path = os.path.join(fixture_path, name)
+
+    if path in fixture_data:
+        return fixture_data[path]
+
     with open(path) as f:
         data = f.read()
+
     try:
         data = json.loads(data)
     except Exception:
         pass
+
+    fixture_data[path] = data
     return data