RFR: 6959: Fix agent tests [v2]

[Gunnar Morling]

> - 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

Gunnar Morling has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  6959: Misc test fixes;
  
  - 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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Changes:
  - all: https://git.openjdk.java.net/jmc/pull/146/files
  - new: https://git.openjdk.java.net/jmc/pull/146/files/f1e62cd3..7f4d01ea

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=146&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=146&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 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