RFR: 8282320: Remove case conversion for debugging log in SSLCipher

[Xue-Lei Andrew Fan]

String.toUpperCase() is used in SSLCipher.java for debugging logging, which is not necessary. See also comment in [this PR](https://github.com/openjdk/jdk/pull/7583).

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Commit messages:
 - 8282320: Remove case conversion for debugging log in SSLCipher

Changes: https://git.openjdk.java.net/jdk/pull/7600/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7600&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282320
  Stats: 8 lines in 1 file changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7600.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7600/head:pull/7600

PR: https://git.openjdk.java.net/jdk/pull/7600