Add only open/reopen scopes to issues

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/models/concerns/issuable.rb

@@ -24,6 +24,8 @@ module Issuable
     scope :unassigned, -> { where("assignee_id IS NULL") }
     scope :of_projects, ->(ids) { where(project_id: ids) }
     scope :opened, -> { with_state(:opened, :reopened) }
+    scope :only_opened, -> { with_state(:opened) }
+    scope :only_reopened, -> { with_state(:reopened) }
     scope :closed, -> { with_state(:closed) }
 
     delegate :name,