RFR: 8185127: Add tests to cover hashCode() method for java supported crypto key types [v8]

[Sibabrata Sahoo]

> This is a simple Test to add few additional API coverage for all java supported key types. The objective of this Test is to cover equals() and hashcode() methods for each key types.

Sibabrata Sahoo has updated the pull request incrementally with one additional commit since the last revision:

  Update CompareKeys.java

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3490/files
  - new: https://git.openjdk.java.net/jdk/pull/3490/files/7e4033e1..b990d100

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3490&range=07
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3490&range=06-07

  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3490.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3490/head:pull/3490

PR: https://git.openjdk.java.net/jdk/pull/3490