RFR: 8254967: com.sun.net.HttpsServer spins on TLS session close

[Michael McMahon]

This fixes a busy loop bug in the Http server which happens sometimes when an SSL connection is closed by the client.

There is no regression test as it is not easy to reproduce and the only effect is that one executor thread gets tied up.

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Commit messages:
 - 8254967: com.sun.net.HttpsServer spins on TLS session close

Changes: https://git.openjdk.java.net/jdk/pull/742/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=742&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254967
  Stats: 6 lines in 1 file changed: 5 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/742.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/742/head:pull/742

PR: https://git.openjdk.java.net/jdk/pull/742