We insert rules in pf_krule_global solely for the benefit of the
'keepcounters' feature. Failing to insert (beause the rule hash
collides, or an identical rule already exists) would be worse than
restoring counts to the wrong rule (or failing to restore them at all).
PR: 282863, 294860, 294859, 294858
MFC after: 3 days
Sponsored by: Rubicon Communications, LLC ("Netgate")