<AWT Dev> RFR: 8253269: The CheckCommonColors test should provide more info on failure

[Sergey Bylokhov]

This test fails from time to time on Linux in mach5.

I was able to reproduce it on one of the hosts and confirm that the root cause was in the slow
systems, which could not complete show/repaint/show/repaint actions in time.
After the fix the test will wait a little bit longer and request a repaint on each falied attempt.

I am also added and additional logging to make possible bugs evaluations easy.

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Commit messages:
 - Update CheckCommonColors.java

Changes: https://git.openjdk.java.net/jdk/pull/494/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=494&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253269
  Stats: 24 lines in 1 file changed: 20 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/494.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/494/head:pull/494

PR: https://git.openjdk.java.net/jdk/pull/494