QA:Testcase SwapOnZRAM disable

Description

Test disable swap-on-zram permanently.

How to test

1. swap-on-zram should be enabled and running to start this test.
2. Permanently disable swap-on-zram.

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

   or

   sudo dnf remove zram-generator-defaults

   And now reboot.

3. Confirm it's stopped:

   $ zramctl
   $ swapon
   NAME      TYPE       SIZE USED PRIO
   /dev/sda5 partition 10.4G   0B   -2
   $ sudo systemctl status swap-create@zram0
   
   ● 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)
   

Expected Results

1. Status should be inactive (dead).
2. There should be no /dev/zram0 device listed for the zramctl and swapon commands.