Removed systemd from the UI

We won't ship systemd officially in 22.04, hence remove it from the UI.
However it's still there and distributed and can be enabled manually.

Co-authored-by: Didier Roche <didrocks@ubuntu.com>

examples/answers-system-setup-reconf.yaml

@@ -8,6 +8,5 @@ WSLConfigurationAdvanced:
   interop_appendwindowspath: false
   automount_enabled: false
   automount_mountfstab: false
-  systemd_enabled: true
 Summary:
   reboot: yes

system_setup/client/controllers/wslconfadvanced.py

@@ -32,8 +32,7 @@ class WSLConfigurationAdvancedController(SubiquityTuiController):
     def run_answers(self):
         if all(elem in self.answers for elem in
                ['interop_enabled', 'interop_appendwindowspath',
-                'automount_enabled', 'automount_mountfstab',
-                'systemd_enabled']):
+                'automount_enabled', 'automount_mountfstab']):
 
             reconfiguration = WSLConfigurationAdvanced(**self.answers)
             self.done(reconfiguration)

system_setup/tests/golden/answers-reconf/wsl.conf

@@ -4,9 +4,6 @@ mountfstab = false
 options = metadata
 root = /custom_mnt_path
 
-[boot]
-command = /usr/libexec/wsl-systemd
-
 [interop]
 appendwindowspath = false
 enabled = false

system_setup/ui/views/wslconfadvanced.py

@@ -59,10 +59,10 @@ class WSLConfigurationAdvancedForm(Form):
         BooleanField(_("Append Windows Path"),
                      help=_("Whether Windows Path will be append in the"
                             " PATH environment variable in WSL."))
-    systemd_enabled = \
-        BooleanField(_("Enable Systemd"),
-                     help=_("EXPERIMENTAL - Whether systemd should be"
-                            " activated at boot time."))
+    # systemd_enabled = \
+    #     BooleanField(_("Enable Systemd"),
+    #                  help=_("EXPERIMENTAL - Whether systemd should be"
+    #                         " activated at boot time."))
 
 
 class WSLConfigurationAdvancedView(BaseView):
@@ -82,8 +82,8 @@ class WSLConfigurationAdvancedView(BaseView):
                 configuration_data.automount_enabled,
             'automount_mountfstab':
                 configuration_data.automount_mountfstab,
-            'systemd_enabled':
-                configuration_data.systemd_enabled,
+            # 'systemd_enabled':
+            #    configuration_data.systemd_enabled,
         }
         self.form = WSLConfigurationAdvancedForm(initial=initial)
 
@@ -107,6 +107,6 @@ class WSLConfigurationAdvancedView(BaseView):
             .automount_enabled.value,
             automount_mountfstab=self.form
             .automount_mountfstab.value,
-            systemd_enabled=self.form
-            .systemd_enabled.value,
-            ))
+            # systemd_enabled=self.form
+            # .systemd_enabled.value,
+        ))