For missing transport, say "PT_MISSING" not "NO_ROUTE"

src/or/connection_or.c

@@ -1198,7 +1198,7 @@ connection_or_connect(const tor_addr_t *_addr, uint16_t port,
 
       control_event_bootstrap_problem(
                                 "Can't connect to bridge",
-                                END_OR_CONN_REASON_NO_ROUTE,
+                                END_OR_CONN_REASON_PT_MISSING,
                                 conn);
 
     } else {

src/or/or.h

@@ -604,7 +604,8 @@ typedef enum {
 #define END_OR_CONN_REASON_NO_ROUTE       6 /* no route to host/net */
 #define END_OR_CONN_REASON_IO_ERROR       7 /* read/write error */
 #define END_OR_CONN_REASON_RESOURCE_LIMIT 8 /* sockets, buffers, etc */
-#define END_OR_CONN_REASON_MISC           9
+#define END_OR_CONN_REASON_PT_MISSING     9 /* PT failed or not available */
+#define END_OR_CONN_REASON_MISC           10
 
 /* Reasons why we (or a remote OR) might close a stream. See tor-spec.txt for
  * documentation of these.  The values must match. */

src/or/reasons.c

@@ -231,6 +231,8 @@ orconn_end_reason_to_control_string(int r)
       return "RESOURCELIMIT";
     case END_OR_CONN_REASON_MISC:
       return "MISC";
+    case END_OR_CONN_REASON_PT_MISSING:
+      return "PT_MISSING";
     case 0:
       return "";
     default: