change network cidr to cidr to prevent NPE

Author: Pearl1594

plugins/network-elements/nsx/src/main/java/org/apache/cloudstack/utils/NsxHelper.java

@@ -36,6 +36,6 @@ public static CreateNsxDhcpRelayConfigCommand createNsxDhcpRelayConfigCommand(Do
 
     public static CreateNsxSegmentCommand createNsxSegmentCommand(DomainVO domain, Account account, DataCenter zone, String vpcName, NetworkVO networkVO) {
         return new CreateNsxSegmentCommand(domain.getName(), account.getAccountName(), zone.getName(),
-                vpcName, networkVO.getName(), networkVO.getGateway(), networkVO.getNetworkCidr());
+                vpcName, networkVO.getName(), networkVO.getGateway(), networkVO.getCidr());
     }
 }