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Add a sysctl to toggle the use of the sockets LOWAT when calculating auto…

Description

Add a sysctl to toggle the use of the sockets LOWAT when calculating auto window growth

Submitted by: j@nitrology.com (Jason Wolfe)
Reviewed by: gnn hiren
Sponsored by: Limelight Networks
Differential Revision: https://reviews.freebsd.org/D11016