QA:Testcase CoreOS switch stream

Description

This test case will focus on testing Fedora CoreOS to upgrade from Stable/Testing to the new stable.

Setup

1. Download and verify the latest stable
2. Download and verify the latest testing

How to test

1. Stop the service that performs automatic updates by executing $ sudo systemctl stop zincati.service
2. Perform the rebase to a different stream and reboot

Available streams: "stable", "testing", and "next"
STREAM="testing"
$ sudo rpm-ostree rebase "fedora/x86_64/coreos/${STREAM}"

Expected Results

1. Inspect the package difference
2. The system will boot the latest release on the new stream and will follow that stream for future updates