JDK-8207347: HeapDumpAllTest.java fails intermittently

[Gary Adams]

I'll try one more time to reproduce the failure running the
serviceability/dcmd tests.

If there are no failures, I plan to close the issue
similar to what was done for
JDK-8217220 <https://bugs.openjdk.java.net/browse/JDK-8217220> 
runtime/NMT/MallocStressTest.java: target process doesn't respond
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