Merge pull request #452 from ncharles/bug_4429/dev/accept_duplicate_ip

Fixes #4429: accepts duplicate ip in Rudder
Merge pull request #469 from ncharles/bug_4576/dev/remove_admin_from_ldap_tree

Fixes #4576: Remove ADMIN fomr ldap tree initialisation
Fixes #4575: remove the POLICYCHILDREN and CHILDRENID from the ldap initialisation