redo selflink_url so that derived classes can provide a different changelist addr
redo selflink_url so that derived classes can provide a different changelist addr

cboling/xos,cboling/xos,open-cloud/xos,open-cloud/xos,opencord/xos,cboling/xos,cboling/xos,opencord/xos,open-cloud/xos,cboling/xos,zdw/xos,zdw/xos,zdw/xos,zdw/xos,opencord/xos