Revert "Support synchronize groups with over 1500 users in Active Directory server"

This reverts commit d833228547.

config/sample-config2.yaml

@@ -38,8 +38,6 @@ ldap_groups:
   lowercase_name: false
   # this attribute must reference to all member DN's of the given group
   member_attribute: member
-  # must be true if group with over 1500 members for Active Directory server
-  need_member_range_retrieval: false
 
 # Connection parameters to PostgreSQL server
 # see also: http://rubydoc.info/gems/pg/PG/Connection#initialize-instance_method

config/schema.yaml

@@ -46,9 +46,6 @@ mapping:
       "member_attribute":
         type: str
         required:  yes
-      "need_member_range_retrieval":
-        type: bool
-        required:  no
 
   "pg_connection":
     type:      any