allow Insight LDAP import integration to select/import more than one OU for an object type

At the moment the LDAP Insight integration does not allow to select/import more than one OU over a single object type when the OUs are located under root of LDAP structure, as the selector in each object type configuration only accept one OU.

There are three ways to overcome this for now:

• create an object type in the schema for each OU
• configure multiple LDAP import job with different OU for each import job over the same object type
• move the OUs we want to import from the Root of the LDAP structure inside another parent new OU, so that when configuring the selector for the object type we insert this parent OU and filter out all the childrens OU contained

Please improve the LDAP import interface to allow inserting more than one OU in the selector for the LDAP import