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svn:author
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vmaffione
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svn:date
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2018-12-03T17:51:22.932105Z
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MFC r340279

netmap: add load balancer program

Add the lb program, which is able to load-balance input traffic
received from a netmap port over M groups, with N netmap pipes in
each group. Each received packet is forwarded to one of the pipes
chosen from each group (using an L3/L4 connection-consistent hash function).
This also adds a man page for lb and some cross-references in related
man pages.

Reviewed by:    bcr, 0mp
Approved by:    gnn (mentor)
Differential Revision:  https://reviews.freebsd.org/D17735

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