RFR 8073181: keytool -ext honored not working correctly

[Weijun Wang]

Hi All

Please review the fix at

     http://cr.openjdk.java.net/~weijun/8073181/webrev.00/

The old honored code have 2 problems:

1. type not read if bare name without critical suffix
2. extension not added if critical flag is not modified

Thanks
Max