LU-2976 tools: ZFS upstream sonames are versioned

LU-2976 tools: ZFS upstream sonames are versioned

Current zfsonlinux upstream has versioned zfs libs sonames, while in
lustre/utils/mount_utils_zfs.c are set unversioned

Versions are
libzfs.so -> libzfs.so.1
libnvpair.so -> libnvpair.so.1

Signed-off-by: Alexey Shvetsov <alexxy@gentoo.org>
Change-Id: I871613081c117731b5ec89fc2d79349df0668f94
Reviewed-on: http://review.whamcloud.com/5742
Tested-by: Hudson
Reviewed-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>