Added set/get instance config endpoints; fixed declarative config bug

instance_config.go

@@ -62,7 +62,15 @@ func SyncInstanceConfig(templateVersion string, instanceConfigPath string, meta
 	}
 
 	for key, value := range meta.Config {
-		rawConfig[key] = value
+		if sub, ok := value.(map[string]interface{}); ok {
+			if existing, ok := rawConfig[key].(map[string]interface{}); ok {
+				for k, v := range sub {
+					existing[k] = v
+				}
+			}
+		} else {
+			rawConfig[key] = value
+		}
 	}
 
 	rawConfig["ServerName"] = meta.ServerName