Add Tests to ensure that kernel arguments persist

[prestist]

As a developer I would like to have test coverage to insure that no regressions are made around kargs.
So that new feature development can happen with the assurance of CI verifying that no regressions have taken place around the kargs functionality.

This stems from an issue where a user

• Installed bootstrap-in-place cluster

• Appended kernel arguments (Ip/namespace in this case)

• Then found after booting the server was still using a dhcp ip

This was later fixed by the MR

Lets add some test coverage to insure that the kargs are functioning as expected.