Only read /dev/random once when the program starts

rather than for every connection, to "conserve entropy".

--HG--
extra : convert_revision : 21df240b71c0af8454725dec9abb428dd4bb97a2

svr-session.c

@@ -78,7 +78,9 @@ void svr_session(int sock, int childpipe,
 		char* remotehost, char *addrstring) {
 
 	struct timeval timeout;
-	
+
+    reseedrandom();
+
 	crypto_init();
 	common_session_init(sock, remotehost);
 
@@ -110,8 +112,6 @@ void svr_session(int sock, int childpipe,
 	/* exchange identification, version etc */
 	session_identification();
 
-	seedrandom();
-
 	/* start off with key exchange */
 	send_msg_kexinit();