RFR: 8266598: Exception values for AnnotationTypeMismatchException are not always informative

[Rafael Winterhalter]

This improves the messages that are provided by `AnnotationTypeMismatchException`s. The message provided by AnnotationTypeMismatchExceptions is deliberately undefined such that this should not break any contract.

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Commit messages:
 - 8266598: Exception values for AnnotationTypeMismatchException are not always informative

Changes: https://git.openjdk.java.net/jdk/pull/3892/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3892&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8266598
  Stats: 21 lines in 3 files changed: 12 ins; 3 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3892.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3892/head:pull/3892

PR: https://git.openjdk.java.net/jdk/pull/3892