RFR: 8260274: Cipher.init(int, key) does not use highest priority provider for random bytes

[Valerie Peng]

Can someone help review this somewhat trivial change?

Updated JCAUtil class to return the cached SecureRandom object only when the provider configuration has not changed. 
Added a regression test to check the affected classes, i.e. AlgorithmParameterGenerator, KeyPairGenerator, Cipher, KeyAgreement, KeyGenerator. 

Thanks,
Valerie

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Commit messages:
 - 8260274: Cipher.init(int, key) does not use highest priority provider for random bytes

Changes: https://git.openjdk.java.net/jdk/pull/3018/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3018&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260274
  Stats: 241 lines in 7 files changed: 220 ins; 0 del; 21 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3018.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3018/head:pull/3018

PR: https://git.openjdk.java.net/jdk/pull/3018