limit path reanimation

* wait for a limited time for dead paths to reanimate and then remove them after that forever

llarp/path/path.cpp

@@ -499,6 +499,9 @@ namespace llarp
       }
     }
 
+    /// how long we wait for a path to become active again after it times out
+    constexpr auto PathReanimationTimeout = 45s;
+
     bool
     Path::Expired(llarp_time_t now) const
     {
@@ -506,7 +509,11 @@ namespace llarp
         return true;
       if (_status == ePathBuilding)
         return false;
-      if (_status == ePathEstablished || _status == ePathTimeout)
+      if (_status == ePathTimeout)
+      {
+        return now >= m_LastRecvMessage + PathReanimationTimeout;
+      }
+      if (_status == ePathEstablished)
       {
         return now >= ExpireTime();
       }