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>
Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: I1844b66e56259da28129df2c60d2542e9c95aeee
Reviewed-on: http://review.whamcloud.com/2998
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Fan Yong <yong.fan@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>