RFR: 8267917: mark hotspot containers tests which ignore external VM flags

[Igor Ignatyev]

Hi all,

could you please review this tiny and trivial patch that adds `@requires vm.flagless` to two container tests that, supposedly, ignore external VM flags?

attn: @mseledts

Cheers,
-- Igor

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Commit messages:
 - 8267917

Changes: https://git.openjdk.java.net/jdk/pull/4241/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4241&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267917
  Stats: 3 lines in 2 files changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4241.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4241/head:pull/4241

PR: https://git.openjdk.java.net/jdk/pull/4241