add SO_REUSEPORT for UDP sockets

Add the option SO_REUSEPORT similar to the linux implementation. Packets
always get distributed round-robin between all sockets.
This is used to scale the dbmd to mo

add SO_REUSEPORT for UDP sockets

Add the option SO_REUSEPORT similar to the linux implementation. Packets
always get distributed round-robin between all sockets.
This is used to scale the dbmd to more threads.

refs #3851

(cherry picked from commit 830a3b79d1f8a0dac43005b0b5e6336ba95b187e)

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7805 want faster clock_gettime
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Joshua M. Clulow <jmc@joyent.com>
Reviewed by: Ryan Zez

7805 want faster clock_gettime
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Joshua M. Clulow <jmc@joyent.com>
Reviewed by: Ryan Zezeski <rpz@joyent.com>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Approved by: Garrett D'Amore <garrett@damore.org>

(cherry picked from commit dd7afb26c5036958cddc0c2c1e499571664a6ed0)

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6818 add MADV_PURGE to provide busted Linux MADV_DONTNEED semantics
Reviewed by: Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>
Reviewed by: Cody Mello <melloc@joyent.com>
Approved by: Garrett D'Amo

6818 add MADV_PURGE to provide busted Linux MADV_DONTNEED semantics
Reviewed by: Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>
Reviewed by: Cody Mello <melloc@joyent.com>
Approved by: Garrett D'Amore <garrett@damore.org>

(cherry picked from commit e67272d0d0c6a150b2455a71938e8de04a5af292)

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7931 pargs(1) still crashes on growing env
Reviewed by: Jason King <jason.brian.king@gmail.com>
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Vitaliy Gusev <gusev.vitaliy@icloud.com>
Reviewe

7931 pargs(1) still crashes on growing env
Reviewed by: Jason King <jason.brian.king@gmail.com>
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Vitaliy Gusev <gusev.vitaliy@icloud.com>
Reviewed by: Simon Klinkert <simon.klinkert@gmail.com>

refs #3336

(cherry picked from commit fb043607a18843c7e65d0b74f8c0affe17045751)

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pargs: Small changes to be consistent with the latest patch for

6565 pargs crashes on growing env

origin commit: 9ff714b8b0dd8f

(cherry picked from commit 4373f4c20f9059f1767fb995f02d7dd82d8966da)

pargs: fix memory corruption

(cherry picked from commit 9ff714b8b0dd8f8f9a4e9c6584025dbf09a1badb)

6416 ptime -p could support multiple processes
Reviewed by: Bryan Cantrill <bryan@joyent.com>
Reviewed by: Ryan Zezeski <ryan@zinascii.com>
Approved by: Dan McDonald <danmcd@omniti.com>

6415 sockets created via t_open/t_bind not shown by pfiles
6432 TLI sockets aren't detected correctly by pfiles in a NGZ
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Garrett D'Amore <ga

6415 sockets created via t_open/t_bind not shown by pfiles
6432 TLI sockets aren't detected correctly by pfiles in a NGZ
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Garrett D'Amore <garrett@damore.org>
Reviewed by: Mohamed A. Khalfella <khalfella@gmail.com>
Approved by: Matthew Ahrens <mahrens@delphix.com>

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