Add Google oauth variable: hostedDomain

Which is part of `passport-google-oauth2`.
It could be used as whitelist to a domain supported by google oauth.
Ref: https://github.com/jaredhanson/passport-google-oauth2/issues/3

Signed-off-by: ike <developer@ikewat.com>

lib/config/environment.js

@@ -101,7 +101,8 @@ module.exports = {
   },
   google: {
     clientID: process.env.CMD_GOOGLE_CLIENTID,
-    clientSecret: process.env.CMD_GOOGLE_CLIENTSECRET
+    clientSecret: process.env.CMD_GOOGLE_CLIENTSECRET,
+    hostedDomain: process.env.CMD_GOOGLE_HOSTEDDOMAIN
   },
   ldap: {
     providerName: process.env.CMD_LDAP_PROVIDERNAME,