Add aws_security_token to credentials file keys (aws#10152)

Author: minjcho

.changes/next-release/enhancement-configure-59283.json

@@ -0,0 +1,5 @@
+{
+  "type": "enhancement",
+  "category": "configure",
+  "description": "Added aws_security_token to the list of keys that are written to the shared credentials file when using aws configure set."
+}

awscli/customizations/configure/set.py

@@ -70,6 +70,7 @@ class ConfigureSetCommand(BasicCommand):
         'aws_access_key_id',
         'aws_secret_access_key',
         'aws_session_token',
+        'aws_security_token',
     ]
 
     def __init__(self, session, config_writer=None):

tests/unit/customizations/configure/test_set.py

@@ -136,6 +136,14 @@ def test_session_token_written_to_shared_credentials_file(self):
             self.fake_credentials_filename,
         )
 
+    def test_security_token_written_to_shared_credentials_file(self):
+        set_command = ConfigureSetCommand(self.session, self.config_writer)
+        set_command(args=['aws_security_token', 'foo'], parsed_globals=None)
+        self.config_writer.update_config.assert_called_with(
+            {'__section__': 'default', 'aws_security_token': 'foo'},
+            self.fake_credentials_filename,
+        )
+
     def test_access_key_written_to_shared_credentials_file_profile(self):
         set_command = ConfigureSetCommand(self.session, self.config_writer)
         set_command(