Fix VPN support to 4.3.8

From OpenFSG

1. Connect to your FSG using SSH via Putty
2. Log in as Admin
3. Log in as a root
4. Edit the file /etc/ppp/options.pptpd with vi

   vi /etc/ppp/options.pptpd

5. Scroll down to the last line and to the end of that line.
6. Type "i" to enter "insert mode" and hit return.
7. Change the last line from:

   mppe required

   to

   mppe required,stateless

   (with no space between "," and "stateless")
8. Save file and exit vi. Hit Escape and type:

   :x

   (this makes to save file and exit vi editor)
9. No need to restart FSG or VPN server. This file seems to be used only when a VPN-client try to make the connection.
10. Now, you will see everybody "at the other side of the tunnel".

And the VPN connection is much more stable than with 3.3.14 ...

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Notes:
Important vi commands:

• ESC and then i to insert
• ESC and then x to delete
• ESC and then : and then w to save
• ESC and then : and than q and than ! to quite without saving

Firmware 4.4.5:
Since 4.4.5 Freecom fixed the bug. The missing ",stateless" in file /etc/ppp/options.pptpd has been added.