RFR(T): [13]: 8217391: [TESTBUG] problem list JFR TestShutdownEvent

[mikhailo.seledtsov at oracle.com]

Please review this trivial change that places the JFR TestShutdownEvent 
on a problem list.
Even though this test ran successfully in pre-integration testing 40 
times, on multiple platforms on
the automated test system, it turned out that it fails in specific way:
   - in Oracle CI
   - at SAP

Problem listing this test for now, while working on the solution.

     JBS: https://bugs.openjdk.java.net/browse/JDK-8217391
     Diff:
         diff --git a/test/jdk/ProblemList.txt b/test/jdk/ProblemList.txt
         --- a/test/jdk/ProblemList.txt
         +++ b/test/jdk/ProblemList.txt
         @@ -878,3 +878,4 @@
         # jdk_jfr

jdk/jfr/event/io/TestInstrumentation.java 8202142    generic-all
+jdk/jfr/event/runtime/TestShutdownEvent.java 8217345    generic-all


Thank you,
Misha