fix for mysql2 postgres2 on fast dropping buckets

weed/filer/filerstore.go

@@ -43,5 +43,5 @@ type FilerStore interface {
 type BucketAware interface {
 	OnBucketCreation(bucket string)
 	OnBucketDeletion(bucket string)
-	IsDropBucketAltogether() bool
+	CanDropWholeBucket() bool
 }

weed/filer/filerstore_wrapper.go

@@ -45,7 +45,7 @@ func NewFilerStoreWrapper(store FilerStore) *FilerStoreWrapper {
 
 func (fsw *FilerStoreWrapper) CanDropWholeBucket() bool {
 	if ba, ok := fsw.defaultStore.(BucketAware); ok {
-		return ba.IsDropBucketAltogether()
+		return ba.CanDropWholeBucket()
 	}
 	return false
 }