LU-8619 lbuild: update ZFS to use 0.6.5.8

LU-8619 lbuild: update ZFS to use 0.6.5.8

Load zfs modules during create_zpool and import_zpool since the zfs
modules are no longer autoloaded.

Update lbuild to build against ZFS 0.6.5.8.

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: I04082cd6cd43c98477100f9fc308666e1b3ebbe5
Reviewed-on: https://review.whamcloud.com/22571
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>