RFR 8029995: accept yes/no for boolean krb5.conf settings

[Sean Mullan]

On 01/28/2014 03:53 AM, Wang Weijun wrote:
> Please review the fix at
>
> http://cr.openjdk.java.net/~weijun/8029995/webrev.00/
>
> The supported boolean values in this fix cover what MIT krb5 does and
> we also added 'f'.
>
> The old getBooleanValue() method returns true for “true” and false
> otherwise but the new method returns null if the value is not
> supported. I’ve carefully changed how the method is called to ensure
> maximum compatibility, but there is still one left:
>
> We support DNS lookup for realm name by default, which means we do it
> if dns_lookup_realm is not set to false, or when unset, if
> dns_fallback is not set to false. Before this change, when
> dns_lookup_realm is set to “unknown”, it means false so DNS lookup is
> not performed. After this change, it’s equivalent to dns_lookup_realm
> unset, and dns_fallback is used. I think the current behavior is
> better than the old one.

I agree, but since it is a behavior change, it should be specified in 
the CCC and release notes.

Fix looks fine otherwise.

--Sean