3775 Upstreaming of ALUA use-after-free fixes from Nexenta
Reviewed by: Saso Kiselkov <skiselkov.ml@gmail.com>
Reviewed by: T Nguyen <truongqnguien@gmail.com>
Approved by: Richard Lowe <richlowe@richlowe.net>
	[illumos-gate merge]

commit ef3b9e2fd29bbac9dc0e750d67355287620587a5
    3775 Upstreaming of ALUA use-after-free fixes from Nexenta