Bug corrections in utils.php

Lines 136 and 278: changed 02770 to 1528 (decimal equivalent)
Lines 137 and 279: changed 0660 to 432 (decimal equivalent)
Line 138: changed chown to user
Line 139: changed chgroup to group

according to the SugarCRM 6.5 Developer Guide, in the Core Preferences section these variables are described in a different way than how they are used here, so they should be fixed.