Revert "Pluggable driver types"

This reverts commit 216385b63e.

mapper/drop_from_schema.go

@@ -1,23 +0,0 @@
-package mapper
-
-import "github.com/rancher/norman/types/mapper"
-
-// DropFromSchema This mapper differs from the existing drop mapper in that
-// it does not remove the field if it is present, only removing the field from
-// the schema. This is so that fields that must be present for formatters and
-// stores will be available, but not shown on the schema
-type DropFromSchema struct {
-	mapper.Drop
-}
-
-func NewDropFromSchema(name string) *DropFromSchema {
-	return &DropFromSchema{
-		mapper.Drop{
-			Field: name,
-		},
-	}
-}
-
-func (d DropFromSchema) FromInternal(data map[string]interface{}) {
-	// Do nothing
-}