Replace ldap_connect with host and port with ldap-URI

[heiglandreas]

The ldap_connect still uses host and port due to some long outdated OpenLDAP-Libs. As the OpenLDAP-Lib version supporting connections via LDAP-URI is by now 11 years old, we should be able to get rid of that old and deprecated feature.

So all calls to ldap_connect($host, $port) should be replaced with calls to ldap_connect($ldapUri)