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Remove "IPFW static rules" rmlock.

Description

Remove "IPFW static rules" rmlock.

Make PFIL's lock global and use it for this purpose.
This reduces the number of locks needed to acquire for each packet.

Obtained from: Yandex LLC
MFC after: 2 weeks
Sponsored by: Yandex LLC
No objection from: network
Differential Revision: https://reviews.freebsd.org/D10154

Details