Add SSL to the TPNS option in System Console > Notifications > Mobile Push so it points to ``https://push-test.mattermost.com``
Documentation notes for PM (Eric):
1. This will require an update to docs from to clarify that the difference between HPNS and TPNS after this change is the SLA.
2. We should also add a statement for HPNS along the lines of "If you’re having delayed push notifications, these are likely caused by system delays by Apple and Google push notification services.". This is because we've investigated the delays multiple times before which pointed to issues with Apple or Google rather than our push proxy service.