RHEL-08-010421 Same grubby behavior than on other tasks

[JSurf]

Describe the Issue
RHEL-08-010421 always executes grubby without checking if page_poison=1 is already set

Expected Behavior
RHEL-08-010421 should check if page_poison=1 is already set
Task should implement similar 'when' conditions as for example RHEL-08-010422 and others before running grubby

Actual Behavior
RHEL-08-010421 does not check if page_poison=1 is already set and always runs grubby which may cause for example unexpected config changes to /etc/default/grub (moving page_poison to the end of the line)

Control(s) Affected
RHEL-08-010421

Environment (please complete the following information):
does not matter

Additional Notes
Maybe there is a reason unknown to me, this is the only rule with grubby that does not do a check ?

Possible Solution
vitecde@cfe8e3d
If you prefer a pull request please let me know

[georgenalen]

Addressed in release 2.3.0