THRIFT-4621 Add THeader for Python

Client: py
diff --git a/lib/py/src/protocol/TProtocol.py b/lib/py/src/protocol/TProtocol.py
index fd20cb7..8314cf6 100644
--- a/lib/py/src/protocol/TProtocol.py
+++ b/lib/py/src/protocol/TProtocol.py
@@ -37,6 +37,7 @@
     BAD_VERSION = 4
     NOT_IMPLEMENTED = 5
     DEPTH_LIMIT = 6
+    INVALID_PROTOCOL = 7
 
     def __init__(self, type=UNKNOWN, message=None):
         TException.__init__(self, message)