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Description of problem:
fix restoreconfig failure

Problem:
-------
$ cat myconfig.json
{
  "storage_objects": [
    {
      "alua_tpgs": [
        {
          "alua_access_type": 0,
          "name": "glfs_tg_pt_gp",
          "tg_pt_gp_id": 1
        }
      ],
      "config": "glfs/test.124.227/block-store/2e189467-00ae-4388-bbd2-a8b4df154671",
      "name": "blockX",
      "plugin": "user",
      "size": 1073741824
    }
  ],
  "targets": []
}

$ targetcli restoreconfig myconfig.json
All configuration cleared
'alua_access_state'

And attributes won't be effected as per myconfig.json:
$ targetcli/backstores/user:glfs/blockX/alua/glfs_tg_pt_gp get alua alua_access_type
alua_access_type=3

Proposed fix: https://github.com/open-iscsi/rtslib-fb/pull/127

(In reply to Prasanna Kumar Kalever from comment #2)
> Proposed fix: https://github.com/open-iscsi/rtslib-fb/pull/127

Merged upstream now.

Fixed in python-rtslib-2.1.fb63-8.el7: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=15766137

Tested with: 
 - kernel-3.10.0-915.el7
 - targetcli-2.1.fb46-6.el7
 - python-configshell-1.1.fb23-4.el7
 - python-rtslib-2.1.fb63-12.el7
The issue is no longer reproducible; No regression found.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2018:3019