RFR: 8264948: Check for TLS extensions total length

Fri Apr 9 05:01:50 UTC 2021

To improve the readability, it would be nice to check the TLS extensions total length while parsing.

No new regression test,  trial update.

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Commit messages:
 - 8264948: Check for TLS extensions total length

Changes: https://git.openjdk.java.net/jdk/pull/3405/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3405&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264948
  Stats: 12 lines in 1 file changed: 12 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3405.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3405/head:pull/3405

PR: https://git.openjdk.java.net/jdk/pull/3405