Change the value parameter of the updateConfiguration API to be required (apache#10790)

Author: bernardodemarco

server/src/main/java/com/cloud/configuration/ConfigurationManagerImpl.java

@@ -1043,6 +1043,10 @@ public Configuration updateConfiguration(final UpdateCfgCmd cmd) throws InvalidP
             category = config.getCategory();
         }
 
+        if (value == null) {
+            throw new InvalidParameterValueException(String.format("The new value for the [%s] configuration must be given.", name));
+        }
+
         validateIpAddressRelatedConfigValues(name, value);
         validateConflictingConfigValue(name, value);
 
@@ -1051,10 +1055,6 @@ public Configuration updateConfiguration(final UpdateCfgCmd cmd) throws InvalidP
             throw new CloudRuntimeException("Only Root Admin is allowed to edit this configuration.");
         }
 
-        if (value == null) {
-            return _configDao.findByName(name);
-        }
-
         ConfigKey.Scope scope = null;
         Long id = null;
         int paramCountCheck = 0;