QA:Testcase SwapOnZRAM disable

Description

Test disabling swap-on-zram permanently.

Setup

1. Make sure your system has swap-on-zram installed and enabled.

How to test

1. Remove the swap-on-zram default configuration:

   sudo dnf remove zram-generator-defaults

   Alternatively, you can override the default config file with an empty one:

   sudo touch /etc/systemd/zram-generator.conf

2. Reboot.
3. Confirm that swap-on-zram is not active. zramctl should not list the /dev/zram0 device:

   $ zramctl
   

   swapon should not list this device either, only disk swap partitions:

   $ swapon
   NAME      TYPE       SIZE USED PRIO
   /dev/sda5 partition 10.4G   0B   -2
   

   The service should be marked as inactive (dead):

   $ sudo systemctl status swap-create@zram0.service
   ● swap-create@zram0.service - Create swap on /dev/zram0
        Loaded: loaded (/usr/lib/systemd/system/swap-create@.service; static; vendor preset: disabled)
        Active: inactive (dead)
          Docs: man:zram-generator(8)
                man:zram-generator.conf(5)
   

4. Return your system back to original state (install the removed package or remove the newly created config override).

Expected Results

1. After removing the default configuration, swap-on-zram should not be active and its device should not be visible in zramctl and swapon commands output.