RFR: Add tabfiles to jcheck configuration [v3]

[Robin Westberg]

On Thu, 5 Nov 2020 13:53:27 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> Magnus Ihse Bursie has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Rename "tabfiles" to "ignore-tabs"
>
> Marked as reviewed by erikj (Reviewer).

Looks good in general, but would be nice with a test to see that it still flags trailing tabs (which I think it is meant to do still, right?)

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PR: https://git.openjdk.java.net/skara/pull/929