ldaplist: Switch to new servicegroups structure

This change amends "ldaplist -l servicegroups" to show the "new"
servicegroups structure ("${PROJECT}.${SERVICEGROUP}").  The old list
("local-${SERVICEGROUP}") is still available by "ldaplist -l
servicegroups.old".

Change-Id: I810f19299ed05d1e2062b7cad6e8b8696205fa47
Merge "ldaplist: Switch to new servicegroups structure" into production