SSL connection shutdown should be quiet.

Server doesn't do the complete SSL shutdown, so we shoulld behave the
same.
This Fix the SIGABRT issue found on FreeBSD.

(cherry picked from commit 0e799530caf759f104e6c3e233d4b306d6e14d7e)

Author: silvakid

cdk/foundation/connection_openssl.cc

@@ -272,6 +272,15 @@ class connection_TLS_impl
   {
     if (m_tls)
     {
+      /*
+      THE SSL standard says that SSL sockets must send and receive a close_notify
+      alert on socket shutdown to avoid truncation attacks. However, this can
+      cause problems since we often hold a lock during shutdown and this IO can
+      take an unbounded amount of time to complete. Since our packets are self
+      describing with length, we aren't vunerable to these attacks. Therefore,
+      we just shutdown by closing the socket (quiet shutdown).
+      */
+      SSL_set_quiet_shutdown(m_tls, 1);
       SSL_shutdown(m_tls);
       SSL_free(m_tls);
     }

cdk/foundation/connection_tcpip_base.h

@@ -76,8 +76,13 @@ class Socket_base::Impl
       catch (...)
       {
       }
-
-      detail::close(m_sock);
+      try
+      {
+        detail::close(m_sock);
+      }
+      catch (...)
+      {
+      }
       m_sock = detail::NULL_SOCKET;
     }
   }