RFR: 8253125 vmTestbase/nsk/stress/stack/stack017.java timed out

[Harold Seigel]

Please review this small change that reduces the amount of thread stack space used by the test in order to reduce the
time required to execute it.  Before and after timings showed that the amount of time needed to execute the test
dropped significantly with this change.

The changes to this test are similar to the changes done to test stack018.java, and others.

The modified test was run on Linux X64, MacOS, and Windows.

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Commit messages:
 - 8253125 vmTestbase/nsk/stress/stack/stack017.java timed out

Changes: https://git.openjdk.java.net/jdk/pull/209/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=209&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253125
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/209.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/209/head:pull/209

PR: https://git.openjdk.java.net/jdk/pull/209