RFR: JDK-8340077 : Open source few Checkbox tests - Set2 [v7]

[Harshitha Onkar]

> Following tests are updated in this PR:
> 
> 1. 	test/jdk/java/awt/Checkbox/CheckboxBoxSizeTest.java
> 2. 	test/jdk/java/awt/Checkbox/CheckboxIndicatorSizeTest.java
> 3. 	test/jdk/java/awt/Checkbox/CheckboxNullLabelTest.java
> 4. 	test/jdk/java/awt/Checkbox/CheckboxPreferredSizeTest.java

Harshitha Onkar has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains nine commits:

 - jtreg tag
 - Merge master
 - test instruction updated
 - removed validate()
 - review fixes, updated problemlist
 - Merge master
 - problemlist updated
 - eof newline
 - checkbox tests

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Changes: https://git.openjdk.org/jdk/pull/21094/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21094&range=06
  Stats: 404 lines in 5 files changed: 404 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21094.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21094/head:pull/21094

PR: https://git.openjdk.org/jdk/pull/21094