PowerStore volume attach fails when LUN is higher than 255

Issue

• This error can be seen in cinder logs:

2024-08-19 11:11:49.282 147 DEBUG oslo.privsep.daemon [-] privsep: Exception during request[139622879339264]: Unexpected error while running command.
  Command: tee -a /sys/class/scsi_host/host11/scan
  Exit code: 1
  Stdout: '0 0 11974'
  Stderr: 'tee: /sys/class/scsi_host/host11/scan: Invalid argument\n' _process_cmd /usr/lib/python3.9/site-packages/oslo_privsep/daemon.py:490
  Traceback (most recent call last):
    File "/usr/lib/python3.9/site-packages/oslo_privsep/daemon.py", line 487, in _process_cmd
      ret = func(*f_args, **f_kwargs)
    File "/usr/lib/python3.9/site-packages/oslo_privsep/priv_context.py", line 255, in _wrap
      return func(*args, **kwargs)
    File "/usr/lib/python3.9/site-packages/os_brick/privileged/rootwrap.py", line 197, in execute_root
      return custom_execute(*cmd, shell=False, run_as_root=False, **kwargs)
    File "/usr/lib/python3.9/site-packages/os_brick/privileged/rootwrap.py", line 145, in custom_execute
      return putils.execute(on_execute=on_execute,
    File "/usr/lib/python3.9/site-packages/oslo_concurrency/processutils.py", line 438, in execute
      raise ProcessExecutionError(exit_code=_returncode,
  oslo_concurrency.processutils.ProcessExecutionError: Unexpected error while running command.
  Command: tee -a /sys/class/scsi_host/host11/scan
  Exit code: 1
  Stdout: '0 0 11974'
  Stderr: 'tee: /sys/class/scsi_host/host11/scan: Invalid argument\n'

• In the previous trace it was trying to use LUN 11974