spread out requests across OSM geocoding servers

This is a temporary measure while we look into setting up our own
Nominatim servers to replace using the OpenStreetMaps ones.

Author: thestinger

nginx/nginx.conf

@@ -178,7 +178,10 @@ http {
 
     upstream nominatim.openstreetmap.org {
         zone nominatim.openstreetmap.org 128k;
-        server nominatim.openstreetmap.org:443 max_conns=1024 max_fails=0 resolve;
+        server europe-01.nominatim.openstreetmap.org:443 max_conns=1024 max_fails=0 resolve;
+        server europe-02.nominatim.openstreetmap.org:443 max_conns=1024 max_fails=0 resolve;
+        server europe-03.nominatim.openstreetmap.org:443 max_conns=1024 max_fails=0 resolve;
+        server stormfly-04.nominatim.openstreetmap.org:443 max_conns=1024 max_fails=0 resolve;
     }
 
     upstream gs-loc.apple.com {