bind: Drop alias handling unnecessary in >= Bullseye

Alias was added to deal with Buster -> Bullseye transition. In Buster the daemon
was named bind9 and in Bullseye the daemon is named named with alias to bind9.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

actions/bind

@@ -39,14 +39,14 @@ def subcommand_setup(arguments):
 
     Path(ZONES_DIR).mkdir(exist_ok=True, parents=True)
 
-    action_utils.service_restart('bind9')
+    action_utils.service_restart('named')
 
 
 def subcommand_configure(arguments):
     """Configure BIND."""
     set_forwarders(arguments.forwarders)
     set_dnssec(arguments.dnssec)
-    action_utils.service_restart('bind9')
+    action_utils.service_restart('named')
 
 
 def main():

plinth/modules/bind/__init__.py

@@ -23,7 +23,7 @@ from . import manifest
 
 version = 2
 
-managed_services = ['bind9', 'named']
+managed_services = ['named']
 
 _description = [
     _('BIND enables you to publish your Domain Name System (DNS) information '
@@ -96,8 +96,7 @@ class BindApp(app_module.App):
             'daemon-bind', managed_services[0], listen_ports=[(53, 'tcp6'),
                                                               (53, 'udp6'),
                                                               (53, 'tcp4'),
-                                                              (53, 'udp4')],
-            alias=managed_services[1])
+                                                              (53, 'udp4')])
         self.add(daemon)
 
         backup_restore = BackupRestore('backup-restore-bind',

plinth/modules/bind/manifest.py

@@ -7,5 +7,5 @@ backup = {
     'config': {
         'files': ['/etc/bind/named.conf.options']
     },
-    'services': ['bind9']
+    'services': ['named']
 }