8129940: JRadioButton does not honor non-standard FocusTraversalKeys

[zhengyu123]

I would like to backport this patch to openjdk8u for parity with Oracle
8u311.

The original bug: https://bugs.openjdk.java.net/browse/JDK-8129940
The original patch:
http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/fbf897c33625

The jdk9 patch does not apply cleanly, but only conflict is copyright
year of BasicRadioButtonUI.java file.

Test:

• Included FocusTraversal/FocusTraversal.java test fails without patch and passes with it on Linux x86_64

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Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Issue

• JDK-8129940: JRadioButton does not honor non-standard FocusTraversalKeys ⚠️ Issue is not open.

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk8u-dev pull/41/head:pull/41
$ git checkout pull/41

Update a local copy of the PR:
$ git checkout pull/41
$ git pull https://git.openjdk.java.net/jdk8u-dev pull/41/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 41

View PR using the GUI difftool:
$ git pr show -t 41

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk8u-dev/pull/41.diff

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Webrevs

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