Allow creation of Shared Networks without IP range if network offering has no services - specifyvlan = true (#10168)

Author: Pearl1594

server/src/main/java/com/cloud/network/NetworkServiceImpl.java

@@ -34,6 +34,7 @@
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Set;
 import java.util.UUID;
 
@@ -1634,6 +1635,10 @@ public Network createGuestNetwork(CreateNetworkCmd cmd) throws InsufficientCapac
             throwInvalidIdException("Network offering with specified id doesn't support adding multiple ip ranges", ntwkOff.getUuid(), NETWORK_OFFERING_ID);
         }
 
+        if (GuestType.Shared == ntwkOff.getGuestType() && !ntwkOff.isSpecifyVlan() && Objects.isNull(associatedNetworkId)) {
+            throw new CloudRuntimeException("Associated network must be provided when creating Shared networks when specifyVlan is false");
+        }
+
         Pair<Integer, Integer> interfaceMTUs = validateMtuConfig(publicMtu, privateMtu, zone.getId());
         mtuCheckForVpcNetwork(vpcId, interfaceMTUs, publicMtu, privateMtu);