Ensuring that we have default options for source plugins. (#961)

lemur/plugins/bases/destination.py

@@ -29,7 +29,7 @@ class ExportDestinationPlugin(DestinationPlugin):
 
     @property
     def options(self):
-        return list(self.default_options) + self.additional_options
+        return self.default_options + self.additional_options
 
     def export(self, body, private_key, cert_chain, options):
         export_plugin = self.get_option('exportPlugin', options)

lemur/plugins/bases/notification.py

@@ -46,7 +46,7 @@ class ExpirationNotificationPlugin(NotificationPlugin):
 
     @property
     def options(self):
-        return list(self.default_options) + self.additional_options
+        return self.default_options + self.additional_options
 
     def send(self, notification_type, message, targets, options, **kwargs):
         raise NotImplementedError

lemur/plugins/bases/source.py

@@ -33,4 +33,4 @@ class SourcePlugin(Plugin):
 
     @property
     def options(self):
-        return list(self.default_options) + self.additional_options
+        return self.default_options + self.additional_options

lemur/plugins/lemur_digicert/plugin.py

@@ -349,6 +349,8 @@ class DigiCertCISSourcePlugin(SourcePlugin):
     author = 'Kevin Glisson'
     author_url = 'https://github.com/netflix/lemur.git'
 
+    additional_options = []
+
     def __init__(self, *args, **kwargs):
         """Initialize source with appropriate details."""
         required_vars = [