RFR: 6660: Make JMX API not return classes

[Jessye Coleman-Shapiro]

This patch modifies the JMX API so that functions return void instead of class arrays.

The name of the function setTransforms was also changed to defineEventProbes as a result of this change because an mbean function whose name begins with "set", has one parameter and a return type of void, gets registered as a setter not an operation.

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Commits:
 - e935d42d: Make JMX API not return classes

Changes: https://git.openjdk.java.net/jmc/pull/32/files
 Webrev: https://webrevs.openjdk.java.net/jmc/32/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JMC-6660
  Stats: 356 lines in 6 files changed: 174 ins; 176 del; 6 mod
  Patch: https://git.openjdk.java.net/jmc/pull/32.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/32/head:pull/32

PR: https://git.openjdk.java.net/jmc/pull/32