Filter out edges that have any speed=0 segments.

They become non-snappable and non-routable.  Note that a single segment
of speed=0 will eliminate the entire edge.

unit_tests/mocks/mock_datafacade.hpp

@@ -62,8 +62,10 @@ class MockDataFacade final : public engine::datafacade::BaseDataFacade
     {
     }
     void GetUncompressedWeights(const EdgeID /* id */,
-                                std::vector<EdgeWeight> & /* result_weights */) const override
+                                std::vector<EdgeWeight> &result_weights) const override
     {
+        result_weights.resize(1);
+        result_weights[0] = 1;
     }
     void GetUncompressedDatasources(const EdgeID /*id*/,
                                     std::vector<uint8_t> & /*data_sources*/) const override