Do not hardcode hpool in load-key

plays/roles/system_zfs/files/load_key/zfs-load-key@.service

@@ -1,5 +1,5 @@
 [Unit]
-Description=Load encryption key for ZFS hpool
+Description=Load encryption key for a ZFS pool
 Documentation=man:zfs(8)
 DefaultDependencies=no
 After=systemd-udev-settle.service
@@ -11,7 +11,7 @@ ConditionPathIsDirectory=/sys/module/zfs
 [Service]
 Type=oneshot
 RemainAfterExit=yes
-ExecStart=/sbin/zfs load-key hpool
+ExecStart=/sbin/zfs load-key %i
 
 [Install]
 WantedBy=zfs.target

plays/roles/system_zfs/tasks/include/load_key.yml

@@ -1,9 +1,7 @@
-# TODO: drop file dependence on hpool.
-
 - name: "load_key : zfs load key service file"
   ansible.builtin.copy:
-    src: "./load_key/zfs-load-key-hpool.service"
-    dest: "/etc/systemd/system/zfs-load-key-hpool.service"
+    src: "./load_key/zfs-load-key@.service"
+    dest: "/etc/systemd/system/zfs-load-key@.service"
     mode: 0644
   register: systemd_zfs_load_key_service_file
 
@@ -13,8 +11,8 @@
   when:
     systemd_zfs_load_key_service_file.changed
 
-- name: "load_key : enable service to load for {{ item }}"
+- name: "load_key : enable service to load key for {{ item }}"
   ansible.builtin.systemd:
-    name: "zfs-load-key-hpool.service"
+    name: "zfs-load-key@{{ item }}.service"
     enabled: true
   loop: "{{ zpools_load_key }}"