trigger tasks on SshPublicKey save and delete

- implement save and delete methods in osusers.models.SshPublicKey that trigger
  set_file_ssh_authorized_keys
- add new test methods to osusers.tests.test_models.SshPublicKeyTest

gnuviechadmin/osusers/models.py

@@ -37,6 +37,7 @@ from ldaptasks.tasks import (
 from fileservertasks.tasks import (
     delete_file_mail_userdir,
     delete_file_sftp_userdir,
+    set_file_ssh_authorized_keys,
     setup_file_mail_userdir,
     setup_file_sftp_userdir,
 )
@@ -579,3 +580,24 @@ class SshPublicKey(TimeStampedModel):
         return "{algorithm} {data} {comment}".format(
             algorithm=self.algorithm, data=self.data, comment=self.comment
         ).strip()
+
+    def save(self, **kwargs):
+        key = super(SshPublicKey, self).save(**kwargs)
+        TaskResult.objects.create_task_result(
+            set_file_ssh_authorized_keys.delay(
+                self.user.username, [
+                    str(key) for key in
+                    SshPublicKey.objects.filter(user=self.user)]),
+            'set_file_ssh_authorized_keys'
+        )
+        return key
+
+    def delete(self, **kwargs):
+        super(SshPublicKey, self).delete(**kwargs)
+        TaskResult.objects.create_task_result(
+            set_file_ssh_authorized_keys.delay(
+                self.user.username, [
+                    str(key) for key in
+                    SshPublicKey.objects.filter(user=self.user)]),
+            'set_file_ssh_authorized_keys'
+        )