Fix update network offering domainids size limitation (apache#12431)

Author: nvazquez

api/src/main/java/org/apache/cloudstack/api/command/admin/network/UpdateNetworkOfferingCmd.java

@@ -75,6 +75,7 @@ public class UpdateNetworkOfferingCmd extends BaseCmd implements DomainAndZoneId
 
     @Parameter(name = ApiConstants.DOMAIN_ID,
             type = CommandType.STRING,
+            length = 4096,
             description = "The ID of the containing domain(s) as comma separated string, public for public offerings")
     private String domainIds;