RFR: 8254717: isAssignableFrom checks in KeyFactorySpi.engineGetKeySpec appear to be backwards

[Ziyi Luo]

All of the "isAssignableFrom" checks in "engineGetKeySpec" appear to be backwards in Java's KeyFactorySpi.engineGetKeySpec implementations. In most cases, the requested KeySpec is equal to the concrete implementation so the inversion does not matter. But there are few cases, as presented in the added jtreg test, will cause unexpected behavior (e.g., ClassCastException rather than an InvalidKeySpecException). The fix is trivial.

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Commit messages:
 - 8254717: isAssignableFrom checks in KeyFactorySpi.engineGetKeySpec appear to be backwards

Changes: https://git.openjdk.java.net/jdk/pull/2681/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2681&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254717
  Stats: 112 lines in 15 files changed: 71 ins; 0 del; 41 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2681.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2681/head:pull/2681

PR: https://git.openjdk.java.net/jdk/pull/2681