cored daemon throws exception when starting scenario with more than 127 annotations

```
What steps will reproduce the problem?
1. create scenario with > 127 annotations
2. press start
3. cored throws exception

What is the expected output? What do you see instead?

Backtrace below:
> CORE daemon v.4.5rc2 started Thu Apr 18 12:37:44 2013 server started,
> listening on: 0.0.0.0:4038 new TCP connection: 127.0.0.1:39965 GUI has
> connected to session 39965 at Thu Apr 18 12:37:49 2013 SESSION message
> flags=0x0 sessions=0 request to modify to session 39965 SESSION 39965
> STATE 1: DEFINITION at Thu Apr 18 12:37:52 2013 SESSION 39965 STATE 2:
> CONFIGURATION at Thu Apr 18 12:37:52 2013 Running hook
> configuration_hook.sh for state 2 location configured: (0.00,0.00,0.00)
> = (47.57917,-122.13232,2.00000) scale=150.00 location configured:
> UTM(565249.28792,5269892.80917,2.00000) default services for type router
> set to ['zebra', 'OSPFv2', 'OSPFv3', 'vtysh', 'IPForward'] connection
> closed: 127.0.0.1:39965 Traceback (most recent call last):
> File "/usr/lib/python2.7/SocketServer.py", line 593, in
> process_request_thread
> self.finish_request(request, client_address) File
> "/usr/lib/python2.7/SocketServer.py", line 334, in finish_request
> self.RequestHandlerClass(request, client_address, self) File
> "/usr/local/sbin/cored", line 124, in __init__ client_address,
> server) File "/usr/lib/python2.7/SocketServer.py", line 649, in
> __init__ self.handle() File "/usr/local/sbin/cored", line 328, in
> handle msg = self.recvmsg() File "/usr/local/sbin/cored", line 231,
> in recvmsg msg = coreapi.CoreMessage(msgflags, msghdr, data)
> File "/usr/local/lib/python2.7/dist-packages/core/api/coreapi.py", line
> 396, in __init__
> self.parsedata(data)
> File "/usr/local/lib/python2.7/dist-packages/core/api/coreapi.py", line
> 423, in parsedata
> self.addtlvdata(tlv.tlvtype, tlv.value)
> File "/usr/local/lib/python2.7/dist-packages/core/api/coreapi.py", line
> 411, in addtlvdata
> raise KeyError, "key already exists: %s (val=%s)" % (k, v)
> KeyError: 'key already exists: 0 (val=\x00\n\x00\n\x00\n\x00\n\x00\n)'

```

Original issue reported on code.google.com by `ahrenh...@gmail.com` on 18 Apr 2013 at 4:46