LB config: String values should not contain whitespace

Author: ustcweizhou

api/src/main/java/org/apache/cloudstack/network/lb/LoadBalancerConfigKey.java

@@ -23,6 +23,8 @@
 import org.apache.cloudstack.network.lb.LoadBalancerConfig.SSLConfiguration;
 import org.apache.cloudstack.network.lb.LoadBalancerConfig.Scope;
 
+import org.apache.commons.lang3.StringUtils;
+
 import com.cloud.utils.Pair;
 
 public enum LoadBalancerConfigKey {
@@ -202,6 +204,12 @@ public static Pair<LoadBalancerConfigKey, String> validate(Scope scope, String k
             }
         }
 
+        if (type.equals(String.class)) {
+            if (StringUtils.containsWhitespace(value)) {
+                return new Pair<>(null, "Please enter valid value without whitespace characters for parameter " + key);
+            }
+        }
+
         if (LbSslConfiguration.key().equals(key)) {
             if (value == null || ! SSLConfiguration.validate(value.toLowerCase())) {
                 return new Pair<>(null, "Please enter valid value in " + String.join(",", SSLConfiguration.getValues()) + " for parameter " + key);