4620 Add OmniOS as a runnable usr/src/test distro
Reviewed by: John Wren Kennedy <john.kennedy@delphix.com>
Approved by: Richard Lowe <richlowe@richlowe.net>
4623 Remove -Wno-unused-label from mpt_sas
Reviewed by: Josef 'Jeff' Sipek <josef.sipek@nexenta.com>
Reviewed by: Keith Wesolowski <keith.wesolowski@joyent.com>
Reviewed by: Albert Lee <trisk@nexenta.com>
Approved by: Robert Mustacchi <rm@joyent.com>
1186 integrate arcstat
Reviewed by: Igor Kozhukhov <ikozhukhov@gmail.com>
Reviewed by: Yuri Pankov <yuri.pankov@nexenta.com>
Approved by: Robert Mustacchi <rm@joyent.com>
	[illumos-gate merge]

commit d0054224e0ba320a05d1c27de508dc5224ff99d1
    1186 integrate arcstat
commit 5a8d3db1a9faa71e948f85f673574967cfdad948
    4623 Remove -Wno-unused-label from mpt_sas
commit cf988fac1debd92859f8068ee3d3e53782043469
    4620 Add OmniOS as a runnable usr/src/test distro

Conflicts:
	usr/src/cmd/stat/arcstat/arcstat.pl (OS-201)
	usr/src/cmd/stat/arcstat/Makefile (OS-201)
	usr/src/cmd/stat/Makefile (OS-147)