LIO RTSLIBFB Crashes on Modern Kernels

[Boris Lukashev]

Attempting to use targetcli with 2023.1 in a 22.04 container on newer kernels results in:
```
/backstores/block> delete iqn.2010-10.org.openstack:volume-...
Traceback (most recent call last):
  File "/usr/bin/targetcli", line 329, in <module>
    main()
  File "/usr/bin/targetcli", line 317, in main
    shell.run_interactive()
  File "/usr/lib/python3/dist-packages/configshell_fb/shell.py", line 900, in run_interactive
    self._cli_loop()
  File "/usr/lib/python3/dist-packages/configshell_fb/shell.py", line 729, in _cli_loop
    self.run_cmdline(cmdline)
  File "/usr/lib/python3/dist-packages/configshell_fb/shell.py", line 843, in run_cmdline
    self._execute_command(path, command, pparams, kparams)
  File "/usr/lib/python3/dist-packages/configshell_fb/shell.py", line 818, in _execute_command
    result = target.execute_command(command, pparams, kparams)
  File "/usr/lib/python3/dist-packages/configshell_fb/node.py", line 1406, in execute_command
    return method(*pparams, **kparams)
  File "/usr/lib/python3/dist-packages/targetcli/ui_backstore.py", line 309, in ui_command_delete
    child.rtsnode.delete(save=save)
  File "/usr/lib/python3/dist-packages/rtslib_fb/tcm.py", line 269, in delete
    for lun in self._gen_attached_luns():
  File "/usr/lib/python3/dist-packages/rtslib_fb/tcm.py", line 215, in _gen_attached_luns
    for tpgt_dir in listdir(tpgts_base):
NotADirectoryError: [Errno 20] Not a directory: '/sys/kernel/config/target/iscsi/cpus_allowed_list'
```
Using iSCSI volumes on the control plane side of things throws:
```
Build of instance f03a94eb-8a93-4073-807a-f158dad320e0 aborted: Unable to update attachment.(Bad or unexpected response from the storage volume backend API: Create export for volume failed (Resource could not be found.).). (HTTP 500)
```

Which is remedied by installing the current version of rtslib_fb into /usr/lib/python3/dist-packages/rtslib_fb. Cinder containers need to pull the current library from pip it appears to avoid crashing in the back-end during volume ops. Front-end error