Revert "Remove admin propagation"

This reverts commit 666c22a4b379e854c95f22947d31f31abd4fbe23.

start.sh

@@ -144,7 +144,7 @@ if [[ -n "${LDAP_SERVER:-}" ]]; then
         "UidAttr"       : "username",
         "MailAttr"      : "mail",
         "WebAttr"       : "",
-        "Groups"        : { },
+        "Groups"        : { "administrator" : "cn=admins,${LDAP_GROUPS_BASE_DN}" },
         "GroupSeparator": ";",
         "Debug"         : false,
         "GroupAttr"     : "memberof",