Switch to checking P_KTHREAD instead of P_SYSTEM when deciding what "system processes" to always ignore.  Based on my testing with `-D', I am pretty sure this is what we want for 5.x-current.  If my thinking is wrong, this also makes it easier to switch to a different check.
Switch to checking P_KTHREAD instead of P_SYSTEM when deciding what
"system processes" to always ignore.  Based on my testing with `-D',
I am pretty sure this is what we want for 5.x-current.  If my thinking
is wrong, this also makes it easier to switch to a different check.

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