UBUNTU: SAUCE: Fix ioctl loop-spin in zed (LP: #1751796)

UBUNTU: SAUCE: Fix ioctl loop-spin in zed (LP: #1751796)

BugLink: https://bugs.launchpad.net/bugs/1751796
Add ZFS 0.6.x kernel ioctl binary compat shim, detect ZFS kernel driver
version and copy zfs ioctl command to the newer ZFS 0.7.0 ioctl command layout.
This allows zed to be upgraded from a pre-0.7.0 ZFS to 0.7.0 without causing
ioctl breakage.

This patch sync's the kernel drivers to the module fixes in userspace, introduced
in version zfsutils-linux 0.7.5-1ubuntu8.  No functional change in the kernel drivers;
this just adds compat structures to allow userspace to copy ioctl data appropriately
in the userspace tools.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>