QA:Testcase Anaconda updates.img via installation source

Description

This test will verify that anaconda can download and apply a updates.img that is inside the remote installation source without extra input from the user. For help preparing updates.img, see Anaconda/Updates

How to test

1. Prepare a remote installation source, if you don't already have one (mirroring the release under test is the easiest way to start)
2. Prepare a valid updates.img file. A suggested approach is to create a dummy updates.img with an empty file:

   mkdir /tmp/updates
   dd if=/dev/zero of=updates.img bs=1k count=1440
   mke2fs updates.img
   mount -o loop updates.img /tmp/updates
   touch /tmp/updates/TESTING123
   umount /tmp/updates
   

   A prebuilt updates.img is also available for download.

3. Copy the updates.img into the images/ directory of the remote installation source you are installing from
4. Boot the installer using the askmethod option at boot and select some protocol (http, nfs) that will use the modified remote installation source where the updates.img was published. See Anaconda/Options for information on supported boot options.
5. Proceed with installation

Expected Results

1. Anaconda prepares the updates.img and copies its content to /tmp/updates/. To confirm this, check for the presence of the file /tmp/updates/TESTING123
2. Anaconda proceeds without error