[#1333] Checkpoint: code done - unit tests to update

Author: fxdupont

src/lib/dhcpsrv/cfg_subnets4.cc

@@ -398,19 +398,17 @@ CfgSubnets4::selectSubnet(const std::string& iface,
         Subnet4Ptr subnet_selected;
 
         // First, try subnet specific interface name.
-        if (!(*subnet)->getIface().empty()) {
-            if ((*subnet)->getIface() == iface) {
-                subnet_selected = (*subnet);
-            }
+       if ((*subnet)->getIface(Network4::Inheritance::NONE) == iface) {
+            subnet_selected = (*subnet);
 
         } else {
             // Interface not specified for a subnet, so let's try if
             // we can match with shared network specific setting of
             // the interface.
             SharedNetwork4Ptr network;
             (*subnet)->getSharedNetwork(network);
-            if (network && !network->getIface().empty() &&
-                (network->getIface() == iface)) {
+            if (network &&
+                (network->getIface(Network4::Inheritance::NONE) == iface)) {
                 subnet_selected = (*subnet);
             }
         }

src/lib/dhcpsrv/network.h

@@ -251,7 +251,7 @@ class Network : public virtual isc::data::StampedElement,
     util::Optional<std::string>
     getIface(const Inheritance& inheritance = Inheritance::ALL) const {
         return (getProperty<Network>(&Network::getIface, iface_name_,
-                                     inheritance, "interface"));
+                                     inheritance));
     };
 
     /// @brief Sets information about relay