incorrect auth url for android fullsync

[blaisefreeman]

Following directions for getting started: https://docs.realm.io/sync/getting-started-1/android-quick-start/step-1-my-first-realm-app

Updated Constants.java correctly, build and runs fine.

Then, attempt to login with a nickname

Expected Results

Expected to login successfully

Actual Results

SyncUser.logInAsync throws an error to the client

Stacktrace showed it was returning an empty header, so I checked the Constants file and realized it was trying to access the cloud via http instead of https which couldn't be right, so I made the change and that fixed it.

Code Sample

Changed this line in Constants.java from...

public static final String AUTH_URL = "http://" + INSTANCE_ADDRESS + "/auth";

to...

public static final String AUTH_URL = "https://" + INSTANCE_ADDRESS + "/auth";

Version of Realm and tooling

Realm version(s): Cloud / Realm Platform / Realm Sync

Android Studio / XCode version: 3.2.1

Which device OS version and device: Mac 10.13/6