QA:Testcase SwapOnZRAM install and enable

Description

Test installation zram-generator and zram-generator-defaults (default enabled)

How to test

1. Recommend removing the following packages. The swap-on-zram implementations in those packages have minor conflicts with zram-generator, but mostly they'll just contribute to user confusion.

   sudo dnf remove anaconda zram

2. Install zram-generator and its defaults package:

   sudo dnf install zram-generator zram-generator-defaults
   

3. Reboot your machine
4. Verify that swap-on-zram is active.

   $ zramctl 
   NAME       ALGORITHM DISKSIZE DATA COMPR TOTAL STREAMS MOUNTPOINT
   /dev/zram0 lzo-rle       1.4G   4K   74B   12K       2 [SWAP]
   

   Notice that /dev/zram0 device is present and it's mounted as [SWAP].

5. Verify that swapon lists the zram device:

   $ swapon 
   NAME       TYPE      SIZE USED PRIO
   /dev/vda1  partition 500M   0B   -2
   /dev/zram0 partition 1.4G   0B   -3
   

   Notice that /dev/zram0 is present. If you have another swap device present, like in the example above, that is not a problem.

Expected Results

1. The zram-generator and zram-generator-defaults are installed without issues, and the feature is automatically activated after a reboot with the proper size. It should have a size equal to 50% of installed memory, or 4GiB, whichever is smaller.