Refine userPassword acl

tests/data/slapd-acl.conf

@@ -57,7 +57,7 @@ access		to attr=objectclass
 
 access		to filter="(objectclass=person)" attr=userpassword dn.subtree=""
 		by anonymous auth
-		by self write
+		by self =wx
 
 access		to dn.children="ou=Alumni Association,ou=People,dc=example,dc=com"
 		by dn.regex=".+,dc=example,dc=com" +c continue