[9] request for review 8046777: apple.security.KeychainStore has a problem searching for identities

[Vincent Ryan]

Please review this fix contributed by David Kocher.

It corrects an issue in the Keychain keystore implementation for Mac OS where 
private keys
configured with a key usage other than ‘any’ are not retrieved.

Bug: https://bugs.openjdk.java.net/browse/JDK-8046777
Webrev: http://cr.openjdk.java.net/~vinnie/8046777/webrev.00/

Thanks.