Add negotiated DNS servers to VPN config am: 8b9538df am: d2102054

                final String interfaceName = mTunnelIface.getInterfaceName();

                final int maxMtu = mProfile.getMaxMtu();

                final List<LinkAddress> internalAddresses = childConfig.getInternalAddresses();

                final List<String> dnsAddrStrings = new ArrayList<>();

                final Collection<RouteInfo> newRoutes = VpnIkev2Utils.getRoutesFromTrafficSelectors(

                        childConfig.getOutboundTrafficSelectors());

                for (final LinkAddress address : internalAddresses) {

                    mTunnelIface.addAddress(address.getAddress(), address.getPrefixLength());

                }

                for (InetAddress addr : childConfig.getInternalDnsServers()) {

                    dnsAddrStrings.add(addr.getHostAddress());

                }

                final NetworkAgent networkAgent;

                final LinkProperties lp;

                    mConfig.routes.clear();

                    mConfig.routes.addAll(newRoutes);

                    // TODO: Add DNS servers from negotiation

                    if (mConfig.dnsServers == null) mConfig.dnsServers = new ArrayList<>();

                    mConfig.dnsServers.clear();

                    mConfig.dnsServers.addAll(dnsAddrStrings);

                    networkAgent = mNetworkAgent;