Do not set process.env.NODE_TLS_REJECT_UNAUTHORIZED

Doing so will affect all https requests which is dangerous.

We have these options to solve this:
1. Use superagent.ca(). Appstore already provides wildcard certs
   for dev, staging signed with appstore_ca. But we then need to
   send across the appstore_ca cert across in the provision call.
   This is a bit of work.

2. Convert superagent into https.request calls and use the
   rejectUnauthorized option.

3. Simply use http. This is what is done in this commit.

Fixes #488

src/config.js

@@ -25,6 +25,7 @@ exports = module.exports = {
 
     // these values are derived
     adminOrigin: adminOrigin,
+    internalAdminOrigin: internalAdminOrigin,
     appFqdn: appFqdn,
     zoneName: zoneName,
 
@@ -163,6 +164,10 @@ function adminOrigin() {
     return 'https://' + appFqdn(constants.ADMIN_LOCATION);
 }
 
+function internalAdminOrigin() {
+    return 'http://127.0.0.1:' + get('port');
+}
+
 function token() {
     return get('token');
 }