Move to auth package in faas-provider

The basic-auth middleware and credentials-loading code has been
moved into the faas-provider project. This has now been brought
back into the faas project via vendoring.

Signed-off-by: Alex Ellis (VMware) <alexellis2@gmail.com>

gateway/types/load_credentials.go

@@ -1,49 +0,0 @@
-package types
-
-import (
-	"fmt"
-	"io/ioutil"
-	"path"
-	"strings"
-)
-
-// BasicAuthCredentials for credentials
-type BasicAuthCredentials struct {
-	User     string
-	Password string
-}
-
-type ReadBasicAuth interface {
-	Read() (error, *BasicAuthCredentials)
-}
-
-type ReadBasicAuthFromDisk struct {
-	SecretMountPath string
-}
-
-func (r *ReadBasicAuthFromDisk) Read() (*BasicAuthCredentials, error) {
-	var credentials *BasicAuthCredentials
-
-	if len(r.SecretMountPath) == 0 {
-		return nil, fmt.Errorf("invalid SecretMountPath specified for reading secrets")
-	}
-
-	userPath := path.Join(r.SecretMountPath, "basic-auth-user")
-	user, userErr := ioutil.ReadFile(userPath)
-	if userErr != nil {
-		return nil, fmt.Errorf("unable to load %s", userPath)
-	}
-
-	userPassword := path.Join(r.SecretMountPath, "basic-auth-password")
-	password, passErr := ioutil.ReadFile(userPassword)
-	if passErr != nil {
-		return nil, fmt.Errorf("Unable to load %s", userPassword)
-	}
-
-	credentials = &BasicAuthCredentials{
-		User:     strings.TrimSpace(string(user)),
-		Password: strings.TrimSpace(string(password)),
-	}
-
-	return credentials, nil
-}