RFR: 8286430: make test TEST="gtest:<sometag>" exits with error when it shouldn't

[Severin Gehwolf]

`make test TEST="gtest:<sometag"` fails for me with google test version `1.10.0`. It expects `suites` to be present in the google test output whereas the OpenJDK build infra code expects `cases`. I'm not sure when/if that changed, but here is a proposed fix.

Thoughts?

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Commit messages:
 - 8286430: make test TEST="gtest:<sometag>" exits with error when it shouldn't

Changes: https://git.openjdk.java.net/jdk/pull/8605/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8605&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8286430
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8605.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8605/head:pull/8605

PR: https://git.openjdk.java.net/jdk/pull/8605