RFR: 215: Verify webrev links before considering publication successful

[Robin Westberg]

On Mon, 13 Jan 2020 07:44:04 GMT, Erik Helin <ehelin at openjdk.org> wrote:

>> Hi all,
>> 
>> Please review this change which ensures that webrev links can be successfully reached before returning from the publication step. 
>> 
>> Best regards,
>> Robin
> 
> Looks good, just a small suggestion on narrowing the range of successful HTTP status codes ��

Thanks for reviewing!

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PR: https://git.openjdk.java.net/skara/pull/345