[jdk15u-dev] Integrated: 8253299: Manifest bytes are read twice when verifying a signed JAR

[Yuri Nesterenko]

I'd like to port this fix here, too. Applies cleanly, all jdk/java/util/jar tests do pass.

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Commit messages:
 - Backport 9bb82232fa0813c8e642af135069ca465f41ba97

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/67/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=67&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253299
  Stats: 6 lines in 1 file changed: 5 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/67.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/67/head:pull/67

PR: https://git.openjdk.java.net/jdk15u-dev/pull/67