RFR: 8321276: runtime/cds/appcds/dynamicArchive/DynamicSharedSymbols.java failed with "'17 2: jdk/test/lib/apps ' missing from stdout/stderr"

[Coleen Phillimore]

Please review this trivial change to fix the test to expect that the TempSymbol refcount is 1 more than expected.  The symbol is cached in [JDK-8315559](https://bugs.openjdk.org/browse/JDK-8315559) Delay TempSymbol cleanup to avoid symbol table churn.

A late change in the review removed draining the queue periodically, which caused this test failure.
Tested locally.

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Commit messages:
 - 8321276: runtime/cds/appcds/dynamicArchive/DynamicSharedSymbols.java failed with "'17 2: jdk/test/lib/apps ' missing from stdout/stderr"

Changes: https://git.openjdk.org/jdk/pull/16954/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16954&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321276
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/16954.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16954/head:pull/16954

PR: https://git.openjdk.org/jdk/pull/16954