Fix kernel cmdline args we add not being propogated to newly installed kernels.

[abadger]

On some upgrades, any kernel commandline args that we were adding were added to the default kernel but once the user installed a new kernel, those args were not propogated to the new kernel. This was happening on S390x and on RHEL7=>8 upgrades.

To fix this, we add the kernel commandline args to both the default kernel and to the defaults for all kernels.

On S390x and upgrades to RHEL9 or greater, this is done by placing the kernel cmdline arguments into the /etc/kernel/cmdline file.

On upgrades to RHEL <= 8 for all architectures other than S390x, this is done by having grub2-editenv modify the /boot/grub2/grubenv file.

TODO:

• [x] Manual testing that this modifies the correct files
• [x] Write unittests for the new functions.

jira: https://issues.redhat.com/browse/OAMG-10424

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[pirat89]

/packit test