apache#4141: Support config list like "config[0].global.maxconn=XXX"

Testing:

```
(local) mgt01 > replace loadbalancerconfigs networkid=bfdf8e5a-86bc-4dcf-9279-10482ffcb8ed scope=Network config[0].global.maxconn=5002 config[0].global.maxpipes=5003

{
  "accountid": "e3a80e2d-0977-11eb-8a7f-069b900033a6",
  "cmd": "org.apache.cloudstack.api.command.user.loadbalancer.ReplaceLoadBalancerConfigsCmd",
  "completed": "2020-11-10T14:42:40+0000",
  "created": "2020-11-10T14:42:28+0000",
  "jobid": "0ea21420-6c48-40c1-9f5f-3fddceac1b0d",
  "jobprocstatus": 0,
  "jobresult": {
    "success": true
  },
  "jobresultcode": 0,
  "jobresulttype": "object",
  "jobstatus": 1,
  "userid": "e3a8b95f-0977-11eb-8a7f-069b900033a6"
}
```

Author: ustcweizhou

api/src/main/java/org/apache/cloudstack/api/command/user/loadbalancer/ReplaceLoadBalancerConfigsCmd.java

@@ -17,7 +17,6 @@
 package org.apache.cloudstack.api.command.user.loadbalancer;
 
 import java.util.Collection;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
@@ -31,7 +30,6 @@
 import org.apache.cloudstack.api.response.SuccessResponse;
 import org.apache.cloudstack.api.response.VpcResponse;
 import org.apache.cloudstack.network.lb.LoadBalancerConfig;
-import org.apache.commons.collections.MapUtils;
 import org.apache.log4j.Logger;
 
 import com.cloud.event.EventTypes;
@@ -78,8 +76,8 @@ public class ReplaceLoadBalancerConfigsCmd extends BaseAsyncCmd {
 
     @Parameter(name = ApiConstants.CONFIG,
                type = CommandType.MAP,
-               description = "configs list, Example: config[0].name=timout&config[0].value=60000")
-    private Map configList;
+               description = "configs list, Example: config[0].global.maxconn=40960")
+    private Map<String, String> configList;
 
 
     /////////////////////////////////////////////////////
@@ -102,20 +100,13 @@ public Long getLoadBalancerId() {
         return loadBalancerId;
     }
 
-    public Map getConfigList() {
+    public Map<String, String> getConfigList() {
         if (configList == null || configList.isEmpty()) {
             return null;
         }
 
-        Map<String, String> configMap = new HashMap<>();
-        if (MapUtils.isNotEmpty(configList)) {
-            for (Map<String, String> config : (Collection<Map<String, String>>)configList.values()) {
-                String name = config.get("name");
-                String value = config.get("value");
-                configMap.put(name, value);
-            }
-        }
-        return configMap;
+        Collection<String> paramsCollection = configList.values();
+        return (Map<String, String>) (paramsCollection.toArray())[0];
     }
 
     /////////////////////////////////////////////////////

server/src/main/java/org/apache/cloudstack/network/lb/LoadBalancerConfigManagerImpl.java

@@ -230,7 +230,7 @@ public List<? extends LoadBalancerConfig> replaceLoadBalancerConfigs(ReplaceLoad
         Long networkId = cmd.getNetworkId();
         Long vpcId = cmd.getVpcId();
         Long loadBalancerId = cmd.getLoadBalancerId();
-        Map configList = cmd.getConfigList();
+        Map<String, String> configList = cmd.getConfigList();
         if (configList == null) {
             throw new InvalidParameterValueException("Invalid config list");
         }
@@ -241,9 +241,8 @@ public List<? extends LoadBalancerConfig> replaceLoadBalancerConfigs(ReplaceLoad
             throw new InvalidParameterValueException("Invalid scope " + scopeStr);
         }
         List<LoadBalancerConfigVO> configs = new ArrayList<LoadBalancerConfigVO>();
-        for (Object obj : configList.keySet()) {
-            String name = String.valueOf(obj);
-            String value = (String) configList.get(name);
+        for (String name : configList.keySet()) {
+            String value = configList.get(name);
             LoadBalancerConfigKey configKey = validateParameters(scope, name, value);
             configs.add(new LoadBalancerConfigVO(scope, networkId, vpcId, loadBalancerId, configKey, value));
         }