Missing sudoers record to allow privset-helper

[Takashi Kajinami]

It seems the sudoers file installed by manila packages do not include the required records to allow usage of privsep-helper. Because of this lvm backend can't be used.

snippet in manila.conf
```
[DEFAULT]
enabled_share_backends=lvm

[lvm]
share_backend_name=lvm
share_driver=manila.share.drivers.lvm.LVMShareDriver
driver_handles_share_servers=False
lvm_share_export_ips=127.0.0.1
```

The error seen in manila-share.log .
```
2023-12-07 02:59:16.941 42613 DEBUG manila.share.manager [None req-7eb117c5-8a4a-4f41-adb0-e9dae5b070a3 - - - - - -] Start initialization of driver: 'LVMShareDriver@np0035967877@lvm' _driver_setup /usr/lib/python3/dist-packages/manila/share/manager.py:364
2023-12-07 02:59:16.944 42613 INFO oslo.privsep.daemon [None req-7eb117c5-8a4a-4f41-adb0-e9dae5b070a3 - - - - - -] Running privsep helper: ['sudo', 'privsep-helper', '--config-file', '/etc/manila/manila.conf', '--privsep_context', 'manila.privsep.sys_admin_pctxt', '--privsep_sock_path', '/tmp/tmp4uzpays_/privsep.sock']
2023-12-07 02:59:16.955 42613 WARNING oslo.privsep.daemon [-] privsep log: sudo: a terminal is required to read the password; either use the -S option to read from standard input or configure an askpass helper
2023-12-07 02:59:16.956 42613 WARNING oslo.privsep.daemon [-] privsep log: sudo: a password is required
2023-12-07 02:59:16.957 42613 CRITICAL oslo.privsep.daemon [None req-7eb117c5-8a4a-4f41-adb0-e9dae5b070a3 - - - - - -] privsep helper command exited non-zero (1)
2023-12-07 02:59:16.958 42613 ERROR manila.share.manager [None req-7eb117c5-8a4a-4f41-adb0-e9dae5b070a3 - - - - - -] Error encountered during initialization of driver LVMShareDriver@np0035967877@lvm: oslo_privsep.daemon.FailedToDropPrivileges: privsep helper command exited non-zero (1)
2023-12-07 02:59:16.958 42613 ERROR manila.share.manager Traceback (most recent call last):
2023-12-07 02:59:16.958 42613 ERROR manila.share.manager File "/usr/lib/python3/dist-packages/manila/share/manager.py", line 367, in _driver_setup
2023-12-07 02:59:16.958 42613 ERROR manila.share.manager self.driver.check_for_setup_error()
2023-12-07 02:59:16.958 42613 ERROR manila.share.manager File "/usr/lib/python3/dist-packages/manila/share/drivers/lvm.py", line 76, in check_for_setup_error
2023-12-07 02:59:16.958 42613 ERROR manila.share.manager out, err = privsep_lvm.list_vgs_get_name()
2023-12-07 02:59:16.958 42613 ERROR manila.share.manager File "/usr/lib/python3/dist-packages/oslo_privsep/priv_context.py", line 269, in _wrap
2023-12-07 02:59:16.958 42613 ERROR manila.share.manager self.start()
2023-12-07 02:59:16.958 42613 ERROR manila.share.manager File "/usr/lib/python3/dist-packages/oslo_privsep/priv_context.py", line 283, in start
2023-12-07 02:59:16.958 42613 ERROR manila.share.manager channel = daemon.RootwrapClientChannel(context=self)
2023-12-07 02:59:16.958 42613 ERROR manila.share.manager File "/usr/lib/python3/dist-packages/oslo_privsep/daemon.py", line 358, in __init__
2023-12-07 02:59:16.958 42613 ERROR manila.share.manager raise FailedToDropPrivileges(msg)
2023-12-07 02:59:16.958 42613 ERROR manila.share.manager oslo_privsep.daemon.FailedToDropPrivileges: privsep helper command exited non-zero (1)
2023-12-07 02:59:16.958 42613 ERROR manila.share.manager
```

[JONGIN (jongini27)]

I have the same issue.

<log>

2024-02-19 04:35:17.458 15 INFO oslo.privsep.daemon [None req-d1f86b5f-e7ee-4cb4-bd15-999208c0e8d1 - - - - - -] Running privsep helper: ['sudo', 'privsep-helper', '--config-file', '/etc/manila/manila.conf', '--privsep_context', 'manila.privsep.sys_admin_pctxt', '--privsep_sock_path', '/tmp/tmp6d52_7wc/privsep.sock']
2024-02-19 04:35:17.474 15 WARNING oslo.privsep.daemon [-] privsep log: sudo: a terminal is required to read the password; either use the -S option to read from standard input or configure an askpass helper
2024-02-19 04:35:17.476 15 WARNING oslo.privsep.daemon [-] privsep log: sudo: a password is required
2024-02-19 04:35:17.485 15 CRITICAL oslo.privsep.daemon [None req-d1f86b5f-e7ee-4cb4-bd15-999208c0e8d1 - - - - - -] privsep helper command exited non-zero (1)
2024-02-19 04:35:17.486 15 ERROR manila.share.manager [None req-d1f86b5f-e7ee-4cb4-bd15-999208c0e8d1 - - - - - -] Error encountered during initialization of driver LVMShareDriver@share-01@manila-01: oslo_privsep.daemon.FailedToDropPrivileges: privsep helper command exited non-zero (1)
2024-02-19 04:35:17.486 15 ERROR manila.share.manager Traceback (most recent call last):
2024-02-19 04:35:17.486 15 ERROR manila.share.manager File "/var/lib/kolla/venv/lib/python3.10/site-packages/manila/share/manager.py", line 357, in _driver_setup
2024-02-19 04:35:17.486 15 ERROR manila.share.manager self.driver.check_for_setup_error()
2024-02-19 04:35:17.486 15 ERROR manila.share.manager File "/var/lib/kolla/venv/lib/python3.10/site-packages/manila/share/drivers/lvm.py", line 76, in check_for_setup_error
2024-02-19 04:35:17.486 15 ERROR manila.share.manager out, err = privsep_lvm.list_vgs_get_name()
2024-02-19 04:35:17.486 15 ERROR manila.share.manager File "/var/lib/kolla/venv/lib/python3.10/site-packages/oslo_privsep/priv_context.py", line 269, in _wrap
2024-02-19 04:35:17.486 15 ERROR manila.share.manager self.start()
2024-02-19 04:35:17.486 15 ERROR manila.share.manager File "/var/lib/kolla/venv/lib/python3.10/site-packages/oslo_privsep/priv_context.py", line 283, in start
2024-02-19 04:35:17.486 15 ERROR manila.share.manager channel = daemon.RootwrapClientChannel(context=self)
2024-02-19 04:35:17.486 15 ERROR manila.share.manager File "/var/lib/kolla/venv/lib/python3.10/site-packages/oslo_privsep/daemon.py", line 358, in __init__
2024-02-19 04:35:17.486 15 ERROR manila.share.manager raise FailedToDropPrivileges(msg)