RFR: 8289401: Add dump output to TestRawRSACipher.java

[Hai-May Chao]

Test TestRawRSACipher.java may fail intermittently. Please review changes to dump out the input and output when it fails.

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Commit messages:
 - 8289401: Add dump output to TestRawRSACipher.java

Changes: https://git.openjdk.org/jdk/pull/9316/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9316&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289401
  Stats: 24 lines in 1 file changed: 22 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/9316.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9316/head:pull/9316

PR: https://git.openjdk.org/jdk/pull/9316