RFR: 8278247: KeyStoreSpi::engineGetAttributes does not throws KeyStoreException

[Weijun Wang]

The specification wrongly claims there could be an exception thrown, but it's not true.

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Commit messages:
 - 8278247: KeyStoreSpi::engineGetAttributes does not throws KeyStoreException

Changes: https://git.openjdk.java.net/jdk/pull/6706/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6706&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278247
  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6706.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6706/head:pull/6706

PR: https://git.openjdk.java.net/jdk/pull/6706