LU-1459 llite: Don't LBUG when import has LUSTRE_IMP_NEW state

LU-1459 llite: Don't LBUG when import has LUSTRE_IMP_NEW state

When a disabled OSC/OST is configured in the system at mount
time, a client will LBUG if calling "lfs check servers".
Disabling the LBUG causes client to return -EIO instead.

Signed-off-by: Jeremy Filizetti <jeremy.filizetti@gmail.com>
Change-Id: Ib689eb37c20d1012728abb7c35aee15f30604d54
Reviewed-on: http://review.whamcloud.com/2993
Tested-by: Hudson
Reviewed-by: Bobi Jam <bobijam@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Johann Lombardi <johann@whamcloud.com>