Update photon controller go SDK in vendor code.

vendor/github.com/vmware/photon-controller-go-sdk/photon/lightwave/oidcclient.go

@@ -18,6 +18,7 @@ import (
 	"io/ioutil"
 	"log"
 	"net/http"
+	"net/url"
 	"strings"
 )
 
@@ -168,6 +169,8 @@ type OIDCTokenResponse struct {
 }
 
 func (client *OIDCClient) GetTokenByPasswordGrant(username string, password string) (tokens *OIDCTokenResponse, err error) {
+	username = url.QueryEscape(username)
+	password = url.QueryEscape(password)
 	body := fmt.Sprintf(passwordGrantFormatString, username, password, client.Options.TokenScope)
 	return client.getToken(body)
 }