RFR: 8065422: Trailing dot in hostname causes TLS handshake to fail with SNI disabled

[Xue-Lei Andrew Fan]

A hostname in an URL ending with a dot is valid (See RFC 1034).  However, it is not a valid SNI hostname.  The ending dot should be ignored while checking the hostname with SNI or the name in a X.509 certificate.

The update should be verified with jshell.  No new regression test added as there is a need of Fully-Qualified Domain Name.
$ $JDK_HOME/bin/jshell
jshell> URL url = new URL("https://www.google.com./");
jshell> URLConnection conn = url.openConnection();
jshell> conn.connect();

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Commit messages:
 - 8065422: Trailing dot in hostname causes TLS handshake to fail with SNI disabled

Changes: https://git.openjdk.java.net/jdk/pull/7205/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7205&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8065422
  Stats: 14 lines in 2 files changed: 11 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7205.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7205/head:pull/7205

PR: https://git.openjdk.java.net/jdk/pull/7205