Replaced the username cookie with a compact auth option.

That option performs authentication of username, password in
a single go for clients that request Connection: Close.

src/worker.h

@@ -50,6 +50,7 @@ enum {
 	HEADER_CSTP_ATYPE,
 	HEADER_DTLS_MTU,
 	HEADER_DTLS_CIPHERSUITE,
+	HEADER_CONNECTION,
 };
 
 enum {
@@ -76,7 +77,12 @@ struct http_req_st {
 	unsigned int next_header;
 	unsigned char cookie[COOKIE_SIZE];
 	unsigned int cookie_set;
-	unsigned int ocuser_cookie_set;
+	/* some CISCO clients reconnect for each request
+	 * and is impossible to keep state for them. For
+	 * that we ask username and password in one go for
+	 * them.
+	 */
+	unsigned int needs_compact_auth;
 	unsigned char master_secret[TLS_MASTER_SIZE];
 	unsigned int master_secret_set;