[Vendor] update go-swagger v0.21.0 -> v0.25.0 (#12670)

* Update go-swagger

* vendor

vendor/github.com/spf13/afero/symlink.go

@@ -0,0 +1,55 @@
+// Copyright © 2018 Steve Francia <spf@spf13.com>.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package afero
+
+import (
+	"errors"
+)
+
+// Symlinker is an optional interface in Afero. It is only implemented by the
+// filesystems saying so.
+// It indicates support for 3 symlink related interfaces that implement the
+// behaviors of the os methods:
+//    - Lstat
+//    - Symlink, and
+//    - Readlink
+type Symlinker interface {
+	Lstater
+	Linker
+	LinkReader
+}
+
+// Linker is an optional interface in Afero. It is only implemented by the
+// filesystems saying so.
+// It will call Symlink if the filesystem itself is, or it delegates to, the os filesystem,
+// or the filesystem otherwise supports Symlink's.
+type Linker interface {
+	SymlinkIfPossible(oldname, newname string) error
+}
+
+// ErrNoSymlink is the error that will be wrapped in an os.LinkError if a file system
+// does not support Symlink's either directly or through its delegated filesystem.
+// As expressed by support for the Linker interface.
+var ErrNoSymlink = errors.New("symlink not supported")
+
+// LinkReader is an optional interface in Afero. It is only implemented by the
+// filesystems saying so.
+type LinkReader interface {
+	ReadlinkIfPossible(name string) (string, error)
+}
+
+// ErrNoReadlink is the error that will be wrapped in an os.Path if a file system
+// does not support the readlink operation either directly or through its delegated filesystem.
+// As expressed by support for the LinkReader interface.
+var ErrNoReadlink = errors.New("readlink not supported")