RFR :8136534: Loading JKS keystore using non-null InputStream results in closed stream

[Seán Coffey]

Backporting this fix to jdk8u-dev sources.

The jdk9 changeset didn't apply cleanly but the fix in essence is the 
removal of a try-with-resources block. Tests are green.

bug report : https://bugs.openjdk.java.net/browse/JDK-8136534
webrev : http://cr.openjdk.java.net/~coffeys/webrev.8136534.8u/webrev/

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Regards,
Sean.