Remove redundant network assert statements

Author: dhlaluku

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

@@ -1025,8 +1025,6 @@ public Network createGuestNetwork(CreateNetworkCmd cmd) throws InsufficientCapac
         boolean bypassVlanOverlapCheck = false;
         if (cmd instanceof CreateNetworkCmdByAdmin) {
             vlanId = ((CreateNetworkCmdByAdmin)cmd).getVlan();
-        }
-        if (cmd instanceof CreateNetworkCmdByAdmin) {
             bypassVlanOverlapCheck = ((CreateNetworkCmdByAdmin)cmd).getBypassVlanOverlapCheck();
         }
 
@@ -1824,11 +1822,10 @@ public boolean deleteNetwork(long networkId, boolean forced) {
 
         // don't allow to delete system network
         if (isNetworkSystem(network)) {
-            assert network != null;
+            
             throwInvalidIdException("Network with specified id is system and can't be removed", network.getUuid(), "networkId");
         }
 
-        assert network != null;
         Account owner = _accountMgr.getAccount(network.getAccountId());
 
         // Only Admin can delete Shared