[Bug 1988366] Re: python-rtslib-fb needs to handle new attribute cpus_allowed_list

[Nobuto Murata]

The latest LTS (jammy) is missing this patch, and causes a failure in
LUN operations when the host is running the HWE kernel, v6.5.

 python3-rtslib-fb | 2.1.74-0ubuntu4   | jammy                  | all
 python3-rtslib-fb | 2.1.74-0ubuntu5   | mantic                 | all
 python3-rtslib-fb | 2.1.74-0ubuntu5   | noble                  | all

Those are the log lines from the ceph-iscsi use cases (to expose an RBD
volume over iSCSI/LIO) and it fails to complete the export creation and
will be stuck at an unrecoverable state unless manually fixing
gateway.conf in rados by deleting a half broken volume.

====
(LUN.allocate) created test-iscsi-pool/disk_1 successfully
(LUN.add_dev_to_lio) Adding image 'test-iscsi-pool/disk_1' to LIO backstore user:rbd
tcmu-runner: tcmu_rbd_open:1162 rbd/test-iscsi-pool.disk_1: address: {172.16.12.185:0/2337103748}
(LUN.add_dev_to_lio) Successfully added test-iscsi-pool/disk_1 to LIO
LUN alloc problem - Delete from LIO/backstores failed - [Errno 20] Not a directory: '/sys/kernel/config/target/iscsi/cpus_allowed_list'
====

similar report:
https://bugs.launchpad.net/python-cinderclient/yoga/+bug/2008010

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https://bugs.launchpad.net/bugs/1988366

Title:
  python-rtslib-fb needs to handle new attribute cpus_allowed_list

Status in python-rtslib-fb package in Ubuntu:
  Fix Released

Bug description:
  python-rtslib-fb needs to properly handle the new kernel module
  attribute cpus_allowed_list.

  This is causing a problem during targetcli-fb's autopkgtest on s390x:

  https://autopkgtest.ubuntu.com/results/autopkgtest-
  kinetic/kinetic/s390x/t/targetcli-fb/20220830_075622_04113@/log.gz

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