RFR: 8066644: Fix deprecation warnings in jdk.zipfs module

[Claes Redestad]

Hiall,

please review this patch which addresses deprecation warnings in 
jdk.zipfs module while applying the same code improvements to similar 
code java.util.zip.ZipUtils

webrev: http://cr.openjdk.java.net/~redestad/8066644/webrev.02
bug: https://bugs.openjdk.java.net/browse/JDK-8066644

Peter Levart brought this up and provided a patch for 
java.util.zip.ZipUtils earlier on this list[1], but this got delayed for 
various reasons. I've now included a fix to an integer overflow issue[2] 
since discovered in java.util.zip.ZipUtils and applied it to 
jdk.nio.zipfs.ZipUtils as well for consistency.

I've updated and given themicrobenchmarks a spin, verifying that the 
LocalDateTime version is still the fastest known approach.

/Claes

[1] 
http://mail.openjdk.java.net/pipermail/core-libs-dev/2015-February/031714.html
[2] https://bugs.openjdk.java.net/browse/JDK-8130914