Comment # 50 on bug 968405 from Dominique Leuenberger

 %_restart_check_systemctl                                \
-    test "$DISABLE_RESTART_ON_UPDATE" = yes && exit 0                \
+    test "$DISABLE_RESTART_ON_UPDATE" != no && exit 0                \

But as /etc/sysconfig/service is not yet sourced at that moment, ANY package
not specifying it =no will NOT restart now (their value of
DISABLE+RESTART_ON_UPDATE is "", not 'no'