Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

WARNS=6 compliance

Teach netstat(1) about the new global netisr policy sysctl,
net.isr.dispatch, and about per-protocol dispatch policies.

MFC after: 3 weeks
Reviewed by: bz
Sponsored by: Juniper Networks, Inc.

While printing out the WSID and CPU ID only the first time it appears for
each workstream, rather than on every protocol, is prettier, it makes
machine-parsing of netstat -Q output a lot harder. Repeat the information
and hope that the user forgives us slightly dense formatting.

MFC after: 3 days
Reported by: bz
Sponsored by: Juniper Networks

Fix off-by-one whitespace error in netstat -Q workstream listing.

Reported by: bz
MFC after: 3 days
Sponsored by: Juniper Networks

Prefer vocabulary of 'Current' and 'Limit' to 'Value' and 'Maximum' in
netstat -Q.

MFC after: 6 days
Sponsored by: Juniper Networks

Teach netstat -Q to work with -N and -M by adding libkvm versions of data
query routines. This code is necessarily more fragile in the presence of
kernel changes than querying the kernel via sysctl (the default), but
useful when investigating crashes or live kernel state via firewire.

MFC after: 1 week
Sponsored by: Juniper Networks

Teach netstat(1) to print out netisr statistics when given the -Q argument.
Currently supports only reporting on live systems via sysctl, kmem support
needs to be edded.

MFC after: 1 week
Sponsored by: Juniper Networks