Add a test that DTLS does not support RC4.

Make sure we don't break that on accident.

Change-Id: I22d58d35170d43375622fe61e4a588d1d626a054
Reviewed-on: https://boringssl-review.googlesource.com/4960
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/ssl/test/runner/common.go b/ssl/test/runner/common.go
index 864f526..feef551 100644
--- a/ssl/test/runner/common.go
+++ b/ssl/test/runner/common.go
@@ -723,6 +723,9 @@
 	// PackHandshakeRecords, if true, causes handshake records to be packed
 	// into individual packets, up to the specified packet size.
 	PackHandshakeRecords int
+
+	// EnableAllCiphersInDTLS, if true, causes RC4 to be enabled in DTLS.
+	EnableAllCiphersInDTLS bool
 }
 
 func (c *Config) serverInit() {