Add TOTP support to Startup message for authentication (#577)

Author: sharmagot

vertica_python/vertica/messages/backend_messages/authentication.py

@@ -57,6 +57,7 @@ class Authentication(BackendMessage):
     PASSWORD_CHANGED = 10  # client doesn't do password changing, this should never be seen
     PASSWORD_GRACE = 11
     OAUTH = 12
+    TOTP = 14
     HASH = 65536
     HASH_MD5 = 65536 + 5
     HASH_SHA512 = 65536 + 512

vertica_python/vertica/messages/frontend_messages/startup.py

@@ -59,7 +59,7 @@ class Startup(BulkFrontendMessage):
 
     def __init__(self, user, database, session_label, os_user_name, autocommit,
                  binary_transfer, request_complex_types, oauth_access_token,
-                 workload, auth_category):
+                 workload, auth_category, totp=None):
         BulkFrontendMessage.__init__(self)
 
         try:
@@ -103,7 +103,8 @@ def __init__(self, user, database, session_label, os_user_name, autocommit,
         if len(oauth_access_token) > 0:
             # compatibility for protocol version 3.11
             self.parameters[b'oauth_access_token'] = oauth_access_token
-
+        if totp is not None:
+            self.parameters[b'totp'] = totp
     def read_bytes(self):
         # The fixed protocol version is followed by pairs of parameter name and value strings.
         # A zero byte is required as a terminator after the last name/value pair.