merge in changes from deLphix-OS 3.2 to 4.0.2.0

Apr 14-23, 2014
	Sebastien Roy	32061 [Backport bug 31632 to 4.0.2.0] The system must not accept nor …	20a9da0
	George Wilson	32703 [Backport bug 32680 to 4.0.2.0] panic after 4.0 upgrade of type …	3fc5332
Matthew Ahrens	ahrens	33096 [Backport bug 32389 to 4.0.2.0] SEEK_HOLE doesn't find the hole …	a079e6a
	George Wilson	33412 [Backport bug 33393 to 4.0.2.0] metaslab group taskq is not …	b6a12bf
	Jordan Place	33517 [Backport bug 33497 to 4.0.2.0] Hit assert in zfs_holey when dm …	84c1c2a
csiden	csiden	32881 [Backport bug 32433 to 4.0.2.0] console app must not be owned	0f5aa68

distant changes dating back to Nov 30, 2012!