RFR 9: 8160278 Remove java/time/test/java/time/TestClock_System from the problem list

[Roger Riggs]

Please review removing TestClock_System from the problem list for Solaris.

The underlying issue[3] has been fixed and propagated to jdk9 and this 
test can be re-enabled.
8157175 GetNanoTimeAdjustment.java fails with excessive adjustment error
8158128 regression: java/time/test/java/time/TestClock_System.java fails 
(closed as a duplicate)

Inline patch:

diff --git a/test/ProblemList.txt b/test/ProblemList.txt
--- a/test/ProblemList.txt
+++ b/test/ProblemList.txt
@@ -336,9 +336,6 @@ com/sun/jdi/GetLocalVariables4Test.sh

  # jdk_time

-java/time/test/java/time/TestClock_System.java 8158128 solaris-all
-
-
  ############################################################################

Thanks, Roger

[1] https://bugs.openjdk.java.net/browse/JDK-8160278

[2] https://bugs.openjdk.java.net/browse/JDK-8158128

[3] https://bugs.openjdk.java.net/browse/JDK-8157175