iscsi:fix the ConditionDirectoryNotEmpty parameter check path during the iscsi.service start · Pull Request !21 · src-anolis-os/iscsi-initiator-utils

bugzilla:https://bugzilla.openanolis.cn/show_bug.cgi?id=21819

Description of problem:
In the higher version of iscsi-initiator-utils-2.1.8, the storage node information path has changed from /var/lib/iscsi/nodes/ directory to /etc/iscsi/nodes/ directory. After merging the 0001-unit-file-tweaks.patch patch, the iscsi service startup will check the ConditionDirectoryNotEmpty parameter, however, in the higher version of iscsi-initiator-utils-2.1.8, the ConditionDirectoryNotEmpty parameter value for /var/lib/iscsi/nodes/ path will cause the iscsi service to fail to start, making it impossible to automatically log into iscsi storage.

Therefore, it is necessary to change the ConditionDirectoryNotEmpty parameter value in the iscsi service to /etc/iscsi/nodes/ path.

Steps to Reproduce:
1.in the Anolis OS 23 version environment, the iSCSI storage node information generated by the command "iscsiadm -m discovery -t st -p 192.168.122.112" is stored in the /etc/iscsi/nodes path.
2.the automatic login is set by the command "iscsiadm -m node -o update -n node.startup -v automatic", and the iscsi service is enabled with the command "systemctl enable iscsi".
3.After reboot the system, the iSCSI service failed to start, and automatic login to the iSCSI storage also failed.

Actual results:
The iSCSI service failed to start, and automatic login to the iSCSI storage also failed.

Expected results:
The iSCSI service started normally and can automatically log in to the iSCSI storage.

Additional info:

```
[root@localhost:~]$ systemctl status iscsi
○ iscsi.service - Login and scanning of iSCSI devices
     Loaded: loaded (/usr/lib/systemd/system/iscsi.service; enabled; preset: disabled)
     Active: inactive (dead)
  Condition: start condition unmet at Mon 2025-06-16 19:13:55 CST; 16h ago
       Docs: man:iscsiadm(8)
             man:iscsid(8)

Jun 16 19:13:55 localhost systemd[1]: iscsi.service - Login and scanning of iSCSI devices was skipped because of an unmet condition check (ConditionDirectoryNotEmp> 
[root@localhost:~]$ 
[root@localhost:~]$ journalctl -u iscsi -f
Jun 16 19:13:55 localhost systemd[1]: iscsi.service - Login and scanning of iSCSI devices was skipped because of an unmet condition check (ConditionDirectoryNotEmpty=/var/lib/iscsi/nodes).

^C
[root@localhost:~]$ cat /usr/lib/systemd/system/iscsi.service
[Unit]
Description=Login and scanning of iSCSI devices
Documentation=man:iscsiadm(8) man:iscsid(8)
DefaultDependencies=no
Before=remote-fs-pre.target
After=network.target network-online.target iscsid.service iscsiuio.service systemd-remount-fs.service
Wants=remote-fs-pre.target
ConditionDirectoryNotEmpty=/var/lib/iscsi/nodes

[Service]
Type=oneshot
ExecStart=-/usr/sbin/iscsiadm -m node --loginall=automatic
ExecReload=-/usr/sbin/iscsiadm -m node --loginall=automatic
SuccessExitStatus=21
RemainAfterExit=true

[Install]
WantedBy=remote-fs.target
[root@localhost:~]$ ls /var/lib/iscsi/nodes
[root@localhost:~]$ ls /etc/iscsi/nodes/
iqn.2099-01.cn.com.zte:usp.spr30-84:13:9f:3e:12:fa  
iqn.2099-01.cn.com.zte:usp.spr30-84:13:9f:3e:13:0f
[root@localhost:~]$
```

See upstream:
https://github.com/open-iscsi/open-iscsi/issues/308

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