IHandoverPacketFilter: add eNB-specific handover gate

Author: MohamedSeliem

src/simu5g/stack/ip2nic/HandoverPacketHolderUe.ned

@@ -25,4 +25,5 @@ simple HandoverPacketHolderUe like IHandoverPacketHolder
         input upperLayerIn;
         input x2In @loose; // required by the interface, but UNUSED
         output stackOut;
+        output hoManagerOut @loose; // to forward packets to handover manager for X2 tunneling
 }

src/simu5g/stack/ip2nic/IHandoverPacketFilter.ned

@@ -21,4 +21,5 @@ moduleinterface IHandoverPacketHolder
         input upperLayerIn;
         input x2In @loose; // only used in eNodeB/gNodeB nodes
         output stackOut;
+        output hoManagerOut @loose; // to forward packets to handover manager for X2 tunneling
 }