RFR: 8279970: two AppCDS tests fail after JDK-8261455

[Yumin Qi]

Please review
  The failure of the two tests is from jtreg run with -Xshare:off, the arguments caused confusion with the test cases. In fact they should be avoided to run with CDS is disabled.

  Tests: tier5 (in testing)
             Manually repeat the test failure in local jtreg, and passed jtreg in local.

Thanks
Yumin

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Commit messages:
 - 8279970: two AppCDS tests fail after JDK-8261455

Changes: https://git.openjdk.java.net/jdk/pull/7070/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7070&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8279970
  Stats: 11 lines in 2 files changed: 9 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7070.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7070/head:pull/7070

PR: https://git.openjdk.java.net/jdk/pull/7070