RFR: JDK-8281671: Class.getCanonicalName should explicitly over array classes

[Joe Darcy]

Add explicit discussion of array types to Class.getCanonicalName, no change in behavior.

I didn't see any existing regression tests for the various "getFooName" methods of Class so I created a new test file for a handful of test cases.

Please also review the corresponding CSR: https://bugs.openjdk.java.net/browse/JDK-8281922

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Commit messages:
 - JDK-8281671: Class.getCanonicalName should explicitly over array classes

Changes: https://git.openjdk.java.net/jdk/pull/7483/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7483&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281671
  Stats: 80 lines in 2 files changed: 80 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7483.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7483/head:pull/7483

PR: https://git.openjdk.java.net/jdk/pull/7483