In https://github.com/rhinstaller/kickstart-tests/pull/1580 we realized that for the tests that perform checks after reboot of installed system the `reboot` command in the kickstart is not necessary to make the installed system reboot. The test reboots as expected also when using the default `shutdown`.
Seems that just the `--wait` argument added to virt-install does the job.

We should

• clarify why it is so
• decide if we want to keep (require for consistency) the `reboot` command in the kickstarts of the tests

so that there are no similar confusions for authors of the tests