4110 panic while reaping htable_cache
Reviewed by: Gordon Ross <Gordon.Ross@nexenta.com>
Reviewed by: Ilya Usvyatsky <Ilya.Usvyatsky@nexenta.com>
Reviewed by: Thomas Keiser <tkeiser@gmail.com>
Reviewed by: Josef 'Jeff' Sipek <josef.sipek@nexenta.com>
Approved by: Garrett D'Amore <garrett@damore.org>
5284 ualarm and usleep need to be suppressed in XPG7
Reviewed by: Robert Mustacchi <rm@joyent.com>
Approved by: Dan McDonald <danmcd@omniti.com>
	[illumos-gate merge]

commit 08eb19132eebba77347f1e2d5adac3f8d1e552ca
    5284 ualarm and usleep need to be suppressed in XPG7
commit b59c4a48daf5a1863ecac763711b497b2f8321e4
    4110 panic while reaping htable_cache