Register feature id for credentials set using boto2 config file (boto#3562)

* Register feature id for credentials set using boto2 config file

Author: ubaskota

botocore/credentials.py

@@ -1491,6 +1491,7 @@ def load(self):
                     access_key, secret_key = self._extract_creds_from_mapping(
                         credentials, self.ACCESS_KEY, self.SECRET_KEY
                     )
+                    register_feature_id('CREDENTIALS_BOTO2_CONFIG_FILE')
                     return Credentials(
                         access_key, secret_key, method=self.METHOD
                     )

botocore/useragent.py

@@ -80,6 +80,7 @@
     'FLEXIBLE_CHECKSUMS_RES_WHEN_REQUIRED': 'c',
     'CREDENTIALS_CODE': 'e',
     'CREDENTIALS_ENV_VARS': 'g',
+    'CREDENTIALS_BOTO2_CONFIG_FILE': 'x',
     'CREDENTIALS_HTTP': 'z',
     'CREDENTIALS_IMDS': '0',
     'BEARER_SERVICE_ENV_VARS': '3',

tests/functional/test_credentials.py

@@ -1281,6 +1281,34 @@ def test_credential_context_override(self):
             [],
             'e',
         ),
+        # Test case 5: Credentials set with Boto2 config
+        (
+            {},
+            {},
+            [
+                patch(
+                    "botocore.configloader.raw_config_parse",
+                    return_value={
+                        "Credentials": {
+                            "aws_access_key_id": "FAKEACCESSKEY",
+                            "aws_secret_access_key": "FAKESECRETKEY",
+                        }
+                    },
+                ),
+                patch(
+                    "botocore.credentials.ConfigProvider.load",
+                    return_value=None,
+                ),
+                patch(
+                    "botocore.credentials.SharedCredentialProvider.load",
+                    return_value=None,
+                ),
+                patch(
+                    "botocore.credentials.EnvProvider.load", return_value=None
+                ),
+            ],
+            'x',
+        ),
     ],
 )
 def test_user_agent_feature_ids(