LU-14285 utils: Add error message when osd_init fails

LU-14285 utils: Add error message when osd_init fails

It was observed that mkfs.lustre fails silently under
function osd_init(). One such case where it silently
fails is when back-end is 'zfs' and libz.so library
is not loaded or under search path.

This patch adds error message in case osd_init() call
fails. It makes end user observe the failure more easily.

Before Patch:
~~~~~~~~~~~~~
$ echo $LD_LIBRARY_PATH
/root/zfs_spl_install/0840/zfs/lib
$ unset LD_LIBRARY_PATH
$ mkfs.lustre --reformat --index 0 --backfstype=zfs --fsname=lustre --mgsnode=192.168.50.140@tcp --mgs --mdt gpool/metadata /dev/sdb1
$ echo $?
22

After Patch:
~~~~~~~~~~~~
$ echo $LD_LIBRARY_PATH
/root/zfs_spl_install/0840/zfs/lib
$ unset LD_LIBRARY_PATH
$ mkfs.lustre --reformat --index 0 --backfstype=zfs --fsname=lustre --mgsnode=192.168.50.140@tcp --mgs --mdt gpool/metadata /dev/sdb1
mkfs.lustre: osd_init() failed : 22 (Invalid argument)
$

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: Ie75b00974852d7a4b95b52d26501e55b66db5891
Reviewed-on: https://review.whamcloud.com/41118
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>