RFR[15] JDK-8245134: test/lib/jdk/test/lib/security/KeyStoreUtils.java should allow to specify aliases

[sha.jiang at oracle.com]

Hi,
This patch adds some new createTrustStore() and createKeyStore() methods 
to test
lib class jdk.test.lib.security.KeyStoreUtils.
These new methods allow to pass trust/key store aliases in.

Issue: https://bugs.openjdk.java.net/browse/JDK-8245134
Webrev: http://cr.openjdk.java.net/~jjiang/8245134/webrev.00/

Best regards,
John Jiang