USSD requests coming over SSMI from 8ta miss a trailing #

This screws up our routing because we assuming to be getting correctly formatted USSD codes from the networks via USSD.

From the emails with Truteq about this:

```
> it seems like the USSD code is malformed, the trailing # is truncated
> from the number. Have a look at our SSMI log output:
>
> 2013-06-19 08:32:37+0000 [SSMIClient,client] SSMIClient RECV USSD:
> SSMI,110,27XXXXXXX,1,0,*120*8864*1108
>
> For other USSD requests we get the exact USSD code dialed and our
> internal routing rules assume this.
> Is this a configuration issue on your side or an 8ta specific quirk
> that we need to accommodate for?

Yes, this is a 8ta special quirk.  We will add a check for it in on our side
as well, but best cater for it also on your side.

```