support junction = circular in all profiles, add additional tests

References:
- https://wiki.openstreetmap.org/wiki/Tag:junction%3Dcircular
- https://lists.openstreetmap.org/pipermail/tagging/2016-November/030520.html
- https://github.com/Project-OSRM/osrm-backend/issues/3361

taginfo.json

@@ -353,7 +353,8 @@
         {
             "key": "junction",
             "object_types": [ "way" ],
-            "value": "circular"
+            "value": "circular",
+            "description": "A Roundabout where the traffic on the roundabout not always has right of way."
         },
         {
             "key": "type",