Update vendor with go dep

This fix updates vendor with `go dep`

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

vendor/github.com/howeyc/gopass/pass.go

@@ -0,0 +1,110 @@
+package gopass
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"os"
+)
+
+type FdReader interface {
+	io.Reader
+	Fd() uintptr
+}
+
+var defaultGetCh = func(r io.Reader) (byte, error) {
+	buf := make([]byte, 1)
+	if n, err := r.Read(buf); n == 0 || err != nil {
+		if err != nil {
+			return 0, err
+		}
+		return 0, io.EOF
+	}
+	return buf[0], nil
+}
+
+var (
+	maxLength            = 512
+	ErrInterrupted       = errors.New("interrupted")
+	ErrMaxLengthExceeded = fmt.Errorf("maximum byte limit (%v) exceeded", maxLength)
+
+	// Provide variable so that tests can provide a mock implementation.
+	getch = defaultGetCh
+)
+
+// getPasswd returns the input read from terminal.
+// If prompt is not empty, it will be output as a prompt to the user
+// If masked is true, typing will be matched by asterisks on the screen.
+// Otherwise, typing will echo nothing.
+func getPasswd(prompt string, masked bool, r FdReader, w io.Writer) ([]byte, error) {
+	var err error
+	var pass, bs, mask []byte
+	if masked {
+		bs = []byte("\b \b")
+		mask = []byte("*")
+	}
+
+	if isTerminal(r.Fd()) {
+		if oldState, err := makeRaw(r.Fd()); err != nil {
+			return pass, err
+		} else {
+			defer func() {
+				restore(r.Fd(), oldState)
+				fmt.Fprintln(w)
+			}()
+		}
+	}
+
+	if prompt != "" {
+		fmt.Fprint(w, prompt)
+	}
+
+	// Track total bytes read, not just bytes in the password.  This ensures any
+	// errors that might flood the console with nil or -1 bytes infinitely are
+	// capped.
+	var counter int
+	for counter = 0; counter <= maxLength; counter++ {
+		if v, e := getch(r); e != nil {
+			err = e
+			break
+		} else if v == 127 || v == 8 {
+			if l := len(pass); l > 0 {
+				pass = pass[:l-1]
+				fmt.Fprint(w, string(bs))
+			}
+		} else if v == 13 || v == 10 {
+			break
+		} else if v == 3 {
+			err = ErrInterrupted
+			break
+		} else if v != 0 {
+			pass = append(pass, v)
+			fmt.Fprint(w, string(mask))
+		}
+	}
+
+	if counter > maxLength {
+		err = ErrMaxLengthExceeded
+	}
+
+	return pass, err
+}
+
+// GetPasswd returns the password read from the terminal without echoing input.
+// The returned byte array does not include end-of-line characters.
+func GetPasswd() ([]byte, error) {
+	return getPasswd("", false, os.Stdin, os.Stdout)
+}
+
+// GetPasswdMasked returns the password read from the terminal, echoing asterisks.
+// The returned byte array does not include end-of-line characters.
+func GetPasswdMasked() ([]byte, error) {
+	return getPasswd("", true, os.Stdin, os.Stdout)
+}
+
+// GetPasswdPrompt prompts the user and returns the password read from the terminal.
+// If mask is true, then asterisks are echoed.
+// The returned byte array does not include end-of-line characters.
+func GetPasswdPrompt(prompt string, mask bool, r FdReader, w io.Writer) ([]byte, error) {
+	return getPasswd(prompt, mask, r, w)
+}