RFR: 8255739: x509Certificate returns � for invalid subjectAlternativeNames

[Masanori Yano]

Could you please review the JDK-8255739 bug fix?

I think sun.security.x509.SubjectAlternativeNameExtension() should throw an exception for incorrect SubjectAlternativeNames instead of returning the substituted characters, which is explained in the description of BugDB.

I modified DerValue.readStringInternal() not to read incorrect SubjectAlternativeNames and throw an IOException. sun.security.x509.X509CertInfo.parse() catch the IOExcepton and ignore it if SAN is a non-ciritical extension like the behavior of the IOException in readStringInternal(). So I added a test with -Djava.security.debug=x509 to confirm that.

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Commit messages:
 - 8255739: x509Certificate returns � for invalid subjectAlternativeNames

Changes: https://git.openjdk.java.net/jdk/pull/6928/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6928&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255739
  Stats: 159 lines in 2 files changed: 158 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6928.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6928/head:pull/6928

PR: https://git.openjdk.java.net/jdk/pull/6928