Permit init(8) use its own cpuset group.

[Alexander V. Chernikov]

Hello list!

Currently init(8) uses group 1 which is root group.
Modifications of this group affects both kernel and userland threads.
Additionally, such modifications are impossible, for example, in presence
of multi-queue NIC drivers (like igb or ixgbe) which binds their threads to
particular cpus.

Proposed change ("init_cpuset" loader tunable) permits changing cpu 
masks for
userland more easily. Restricting user processes to migrate to/from CPU 
cores
used for network traffic processing is one of the cases.

Phabricator: https://phabric.freebsd.org/D141 (the same version attached 
inline)

If there are no objections, I'll commit this next week.
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