RFR: Update tables in java.base to be HTML5-friendly.

[Martin Buchholz]

Jonathan Gibbons for  "css style czar"!

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I checked the tables at
http://cr.openjdk.java.net/~jjg/8179479-8179592/api/java/util/concurrent/BlockingDeque.html
They look perfectly fine, although I feel a twinge of
non-collapsed-border-nostalgia.

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Yes, "striped" is a much better name than "altrows".  "striped-tables" as
you suggest may be better.  Choose your names carefully - we can't change
them in the future.

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w3.org doc seems to suggest we should only be defining table styles with
borders.

https://www.w3.org/TR/html5/tabular-data.html#attr-table-border

"""Tables should not be used as layout aids. """

"""User agents, especially those that do table analysis on arbitrary
content, are encouraged to find heuristics to determine which tables
actually contain data and which are merely being used for layout. """