RFR: 7124527: [macosx] SwingSet2, label is not read by VoiceOver when focus is on textfield for Internalframe and Table demo.

[Abhishek Kumar]

In SwingSet2, few label components are not set for textfield component in InternalFrame and Table demo and due to this VoiceOver doesn't announce the label along with the textfield value. Added a fix for that and verified in SwingSet2.

Apart from that for Selection mode combobox and Autoresize combobox, VoiceOver doesn't announce the combobox panel details along with combobox current item. 

Although the bug doesn't report this but in Slider demo it is observed that VoiceOver announces the slider value and panel details together.

So, added a fix similar to slider demo for combobox in tabledemo.

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Commit messages:
 - Label fix for textfield in Swingset2 demo

Changes: https://git.openjdk.org/jdk/pull/13268/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13268&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-7124527
  Stats: 6 lines in 2 files changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13268.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13268/head:pull/13268

PR: https://git.openjdk.org/jdk/pull/13268