Rename AWS unit tests that are not running when changing the module (#42712)

now can use `ansible-test units module_name` for the aws_s3 and aws_api_gateway modules

changes to modules/cloud/amazon/aws_api_gateway and modules/cloud/amazon/aws_s3 are not triggering the unit tests; also fix aws_s3 from importing non-exist module and skipping tests

changes to module_utils/aws/core.py are only being unit tested on modules that import from the file (if they have a corresponding test) or tests that import from the file themselves.

test/units/modules/cloud/amazon/test_aws_s3.py

@@ -0,0 +1,34 @@
+import pytest
+
+import unittest
+
+try:
+    import ansible.modules.cloud.amazon.aws_s3 as s3
+except ImportError:
+    pytestmark = pytest.mark.skip("This test requires the s3 Python libraries")
+
+from ansible.module_utils.six.moves.urllib.parse import urlparse
+
+boto3 = pytest.importorskip("boto3")
+
+
+class TestUrlparse(unittest.TestCase):
+
+    def test_urlparse(self):
+        actual = urlparse("http://test.com/here")
+        self.assertEqual("http", actual.scheme)
+        self.assertEqual("test.com", actual.netloc)
+        self.assertEqual("/here", actual.path)
+
+    def test_is_fakes3(self):
+        actual = s3.is_fakes3("fakes3://bla.blubb")
+        self.assertEqual(True, actual)
+
+    def test_get_s3_connection(self):
+        aws_connect_kwargs = dict(aws_access_key_id="access_key",
+                                  aws_secret_access_key="secret_key")
+        location = None
+        rgw = True
+        s3_url = "http://bla.blubb"
+        actual = s3.get_s3_connection(None, aws_connect_kwargs, location, rgw, s3_url)
+        self.assertEqual(bool("bla.blubb" in str(actual._endpoint)), True)