RFR: 8274524: SSLSocket.close() hangs if it is called during the ssl handshake [v2]

[Alexey Bakhtin]

> Please review the patch for the JDK-8274524
> 
> SSLSocket.close() could cause an intermittent hang of the socket read operation. It happens in case of SO_TIMEOUT is set to 0 (infinite timeout).
> SSLSocket.close() reads from the socket as part of the skip() operation to prevent TCP Connection reset (see JDK-8268965). Socket reads are performed in a loop for small chunks. These read operations could cause a deadlock, in case of SO_TIMEOUT = 0
> I suggest to force non-zero SO_TIMEOUT during the skip() operation to prevent such deadlock
> 
> This is a second iteration of review. Previous PR was closed without integration: https://github.com/openjdk/jdk/pull/5760

Alexey Bakhtin has updated the pull request incrementally with one additional commit since the last revision:

  Change read timeout value for skip

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7432/files
  - new: https://git.openjdk.java.net/jdk/pull/7432/files/7ac94818..6ea30075

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7432&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7432&range=00-01

  Stats: 6 lines in 1 file changed: 5 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7432.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7432/head:pull/7432

PR: https://git.openjdk.java.net/jdk/pull/7432