Added fix for multitenant error (#394)

* Added fix for multitenant error

* Fixed issue with room lock when using ldap

* Fixed test cases

* Fixed rubocop issue

* Included internal documentation for LDAP ENV variables

app/models/concerns/api_concern.rb

@@ -18,6 +18,9 @@
 
 module APIConcern
   extend ActiveSupport::Concern
+
+  RETURNCODE_SUCCESS = "SUCCESS"
+
   def bbb_endpoint
     Rails.configuration.bigbluebutton_endpoint
   end

app/models/room.rb

@@ -27,7 +27,6 @@ class Room < ApplicationRecord
 
   belongs_to :owner, class_name: 'User', foreign_key: :user_id
 
-  RETURNCODE_SUCCESS = "SUCCESS"
   META_LISTED = "gl-listed"
 
   # Determines if a user owns a room.