TLS 1.3 support.

Well, at least -draft-16, and we don't quite parse all extensions yet
(not that there is that much left to parse).

src/analyzer/protocol/ssl/SSL.h

@@ -23,6 +23,9 @@ public:
 
 	void SendHandshake(const u_char* begin, const u_char* end, bool orig);
 
+	// tell the analyzer that encryption has started.
+	void StartEncryption();
+
 	// Overriden from tcp::TCP_ApplicationAnalyzer.
 	virtual void EndpointEOF(bool is_orig);