Add string for IP_NOW_REDUNDANT in circuit_end_reason_to_control_string

Closes 14207; bugfix on 0.2.6.2-alpha.

changes/bug14207

@@ -0,0 +1,3 @@
+  o Minor bugfixes (controller):
+    - Add a code for the END_CIRC_REASON_IP_NOW_REDUNDANT circuit close
+      reason.  Fixes bug 12407; bugfix on 0.2.6.2-alpha.

src/or/reasons.c

@@ -350,6 +350,8 @@ circuit_end_reason_to_control_string(int reason)
       return "NOSUCHSERVICE";
     case END_CIRC_REASON_MEASUREMENT_EXPIRED:
       return "MEASUREMENT_EXPIRED";
+    case END_CIRC_REASON_IP_NOW_REDUNDANT:
+      return "IP_NOW_REDUNDANT";
     default:
       if (is_remote) {
         /*