Bug#775775: ca-certificates-java: please add support for more JDK

[Simon Deziel]

I have came up with a very similar patch [1] that adds support for a
couple more JDK versions (OpenJDK and Oracle present and future versions).

The patch only touches the jks-keystore hook but the same logic would
apply to the postinst.

1:
https://bugs.launchpad.net/debian/+source/ca-certificates-java/+bug/1449652/+attachment/4386860/+files/jks-keystore.patch