[Dibbler] Patch for DP when Forwarding is on.

[MINODIER David RD-RESA-LAN]

Hi again,

regarding Prefix delegation, it seems that there is a little bug in:
ClntIfaceMgr/ClntIfaceMgr.cpp, in function :
bool TClntIfaceMgr::modifyPrefix(int iface, SPtr<TIPv6Addr> prefix, int
prefixLen, unsigned int pref, unsigned int valid,  PrefixModifyMode
mode) line 393.

This function is more or less divided into two parts:
- 1) prefix_forwarding is NOT enabled,
this section if fine.

- 2) prefix forwarding IS enabled: (starts at line 444):
here, prefix operation will apply to ALL interfaces.
Hence, lines 503-519:
   switch (mode) {
   case PREFIX_MODIFY_ADD:
       status = prefix_add(ptrIface->getName(), iface,
tmpAddr->getPlain(), prefixLen+8, pref, valid);
       break;
   case PREFIX_MODIFY_UPDATE:
       status = prefix_update(ptrIface->getName(), iface,
tmpAddr->getPlain(), prefixLen+8, pref, valid);
       break;
   case PREFIX_MODIFY_DEL:
       status = prefix_del(ptrIface->getName(), iface,
tmpAddr->getPlain(), prefixLen+8);
       break;
   }
   if (status!=LOWLEVEL_NO_ERROR) {
       string tmp = error_message();
       Log(Error) << "Prefix error encountered during " << action << " 
operation: " << tmp << LogEnd;
       return false;

should be replaced with:

   switch (mode) {
   case PREFIX_MODIFY_ADD:
       status = prefix_add(x->getName(), x->getID(), prefix->getPlain(),
prefixLen, pref, valid);
       break;
   case PREFIX_MODIFY_UPDATE:
       status = prefix_update(x->getName(), x->getID(),
prefix->getPlain(), prefixLen, pref, valid);
       break;
   case PREFIX_MODIFY_DEL:
       status = prefix_del(x->getName(), x->getID(), prefix->getPlain(),
prefixLen);
       break;
   }
   if (status!=LOWLEVEL_NO_ERROR) {
       string tmp = error_message();
       Log(Error) << "Prefix error encountered during " << action << "
operation: " << tmp << LogEnd;
       return false;
   }
   }
   return true;


since we wanna apply PD to every interfaces pointed by x within the 
while loop, and not to the "main" interface ptrIface.

Here's the patch.
David.
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