Set the session id context properly to make client authentication work with open ssl provider.

Motivation:

When netty is used with open ssl provider and client authentication the following errors can occur:
error:140D9115:SSL routines:ssl_get_prev_session:session id context uninitialized
error:140A1175:SSL routines:ssl_bytes_to_cipher_list:inappropriate fallback
error:140760FC:SSL routines:SSL23_GET_CLIENT_HELLO:unknown protocol

Modifications:

Set the session id context in OpenSslServerContext so that sessions which use client authentication
which are cached have the same context id value.

Result:

Client authentication now works with open ssl provider.

handler/src/main/java/io/netty/handler/ssl/OpenSslServerContext.java

@@ -36,6 +36,7 @@ import static io.netty.util.internal.ObjectUtil.*;
  * A server-side {@link SslContext} which uses OpenSSL's SSL/TLS implementation.
  */
 public final class OpenSslServerContext extends OpenSslContext {
+    private static final byte[] ID = new byte[] {'n', 'e', 't', 't', 'y'};
     private final OpenSslServerSessionContext sessionContext;
 
     /**
@@ -439,6 +440,7 @@ public final class OpenSslServerContext extends OpenSslContext {
                 }
             }
             sessionContext = new OpenSslServerSessionContext(ctx);
+            sessionContext.setSessionIdContext(ID);
             success = true;
         } finally {
             if (!success) {