RFR: 8045: retransformClasses() doesn't retransform all needed classes

[Ralf Schmelter]

8045: retransformClasses() doesn't retransform all needed classes

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Commit messages:
 - Fixed copyright year
 - Added test
 - Fixed retransformClasses() methods

Changes: https://git.openjdk.org/jmc/pull/471/files
 Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=471&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-8045
  Stats: 143 lines in 4 files changed: 129 ins; 4 del; 10 mod
  Patch: https://git.openjdk.org/jmc/pull/471.diff
  Fetch: git fetch https://git.openjdk.org/jmc pull/471/head:pull/471

PR: https://git.openjdk.org/jmc/pull/471