RFR: 6996: Invoking converters/stringify for event fields

[Gunnar Morling]

@thegreystone, ran into this left-over from the converter change: no converters/stringify was invoked for field attributes. I've attributed it to the same issue you worked on.

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Commit messages:
 - 6996: Invoking converters/stringify for event fields

Changes: https://git.openjdk.java.net/jmc/pull/174/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=174&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-6996
  Stats: 25 lines in 1 file changed: 18 ins; 0 del; 7 mod
  Patch: https://git.openjdk.java.net/jmc/pull/174.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/174/head:pull/174

PR: https://git.openjdk.java.net/jmc/pull/174