Align with Grails controller terminology

Author: codeconsole

grails-datastore-gorm-test/src/test/groovy/org/grails/datastore/gorm/CustomAutoTimestampSpec.groovy

@@ -40,6 +40,6 @@ class CustomAutoTimestampSpec extends GormDatastoreSpec {
 class RecordCustom {
     Long id
     String name
-    @AutoTimestamp(ON_INSERT) Date created
+    @AutoTimestamp(SAVE) Date created
     @AutoTimestamp Date modified
 }

grails-datastore-gorm/src/main/groovy/grails/gorm/annotation/AutoTimestamp.java

@@ -35,12 +35,12 @@
      * Enum to specify when auto-timestamping should occur.
      */
     enum EventType {
-        ON_INSERT,
-        ON_UPDATE
+        SAVE,
+        UPDATE
     }
 
     /**
      * When to apply auto-timestamping
      */
-    EventType value() default EventType.ON_UPDATE;
+    EventType value() default EventType.UPDATE;
 }

grails-datastore-gorm/src/main/groovy/org/grails/datastore/gorm/events/AutoTimestampEventListener.java

@@ -170,7 +170,7 @@ protected void storeDateCreatedAndLastUpdatedInfo(PersistentEntity persistentEnt
                         Field field = getFieldFromHierarchy(persistentEntity, property.getName());
                         if (field != null && field.isAnnotationPresent(AutoTimestamp.class)) {
                             AutoTimestamp autoTimestamp = field.getAnnotation(AutoTimestamp.class);
-                            if (autoTimestamp.value() == AutoTimestamp.EventType.ON_UPDATE) {
+                            if (autoTimestamp.value() == AutoTimestamp.EventType.UPDATE) {
                                 storeTimestampAvailability(entitiesWithLastUpdated, persistentEntity, property);
                             } else {
                                 storeTimestampAvailability(entitiesWithDateCreated, persistentEntity, property);