LU-4313 osp: continue waiting for -ENOTCONN

LU-4313 osp: continue waiting for -ENOTCONN

in osp_precreate_reserve, -ENOTCONN should also be treated
as recoverable errors, such as -ENODEV, and continue waiting
the object to be created by OSP once it completes recovery.

This patch is back-ported from the following one:
Lustre-commit: 3a2073d3bf9fab33fa26c5c5f0da2b0821185131
Lustre-change: http://review.whamcloud.com/8415

Signed-off-by: Hongchao Zhang <hongchao.zhang@intel.com>
Change-Id: I1fd13c8bec9b7827396ec922cb985ee642a5e286
Signed-off-by: Jian Yu <jian.yu@intel.com>
Reviewed-on: http://review.whamcloud.com/8468
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>