RFR: [15]JDK-8247955,doclint: don't complain about summary/caption when role=presentation

Sat Jun 20 02:40:21 UTC 2020

Please review a small adjustment for doclint: to suppress the check for
a table having a caption when the table has `role=presentation`.

There's an existing AccessibilityTest.java, but that is still focussed on
HTML 4, which does not support role=presentation. So, a new test
is added (for now) that is focussed on this test case, in HTML 5.
When we drop support for HTML 4, we should merge the two files.

-- Jon

JBS: https://bugs.openjdk.java.net/browse/JDK-8247955
Webrev: http://cr.openjdk.java.net/~jjg/8247955/webrev.00/