Remove SSL_OP_TLS_ROLLBACK_BUG.

It's not part of SSL_OP_ALL and is unused, so remove it. Add a test that
asserts the version check works.

Change-Id: I917516594ec5a4998a8316782f035697c33d99b0
Reviewed-on: https://boringssl-review.googlesource.com/1418
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/ssl/test/runner/common.go b/ssl/test/runner/common.go
index eb1d57c..d69f09f 100644
--- a/ssl/test/runner/common.go
+++ b/ssl/test/runner/common.go
@@ -396,6 +396,11 @@
 	// handshake record. Handshake messages will be split at the record
 	// layer.
 	MaxHandshakeRecordLength int
+
+	// RsaClientKeyExchangeVersion, if non-zero, causes the client to send a
+	// ClientKeyExchange with the specified version rather than the
+	// client_version when performing the RSA key exchange.
+	RsaClientKeyExchangeVersion uint16
 }
 
 func (c *Config) serverInit() {