Add api_allowed_attributes to ExtManagementSystem and Provider

The addition of the api_allowed_attributes method will allow individual providers to have better control over the attributes that are allowed on a provider, including aliases that are more clear to the user.

app/models/ext_management_system.rb

@@ -27,6 +27,10 @@ def self.supported_types_and_descriptions_hash
     end
   end
 
+  def self.api_allowed_attributes
+    %w[]
+  end
+
   belongs_to :provider
   has_many :child_managers, :class_name => 'ExtManagementSystem', :foreign_key => 'parent_ems_id'
 

app/models/provider.rb

@@ -34,6 +34,10 @@ def self.short_token
     parent.name.demodulize
   end
 
+  def self.api_allowed_attributes
+    %w[]
+  end
+
   def image_name
     self.class.short_token.underscore
   end