RFR: 9999: Misc test fixes;

Fri Oct 30 20:42:56 UTC 2020

- AllTests suite caused duplicate event class definitions
- Version parsing code assumed presence of "." which isn't the case with JDK 9+
- Duplicate event class in TestIncorrectMethodDescriptor

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Commit messages:
 - 9999: Misc test fixes;

Changes: https://git.openjdk.java.net/jmc/pull/146/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=146&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-9999
  Stats: 84 lines in 3 files changed: 15 ins; 48 del; 21 mod
  Patch: https://git.openjdk.java.net/jmc/pull/146.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/146/head:pull/146

PR: https://git.openjdk.java.net/jmc/pull/146