use emplace where appropriate per clang-tidy

The clang-tidy warning 'modernize-use-emplace' correctly flags a
few places where emplace should be used over push.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I6ca79285a87d6927e718345dc8dce0387e6b1eda
diff --git a/redfish-core/lib/redfish_v1.hpp b/redfish-core/lib/redfish_v1.hpp
index a9b81e4..b3174fb 100644
--- a/redfish-core/lib/redfish_v1.hpp
+++ b/redfish-core/lib/redfish_v1.hpp
@@ -88,7 +88,7 @@
         nlohmann::json::object_t member;
         member["@odata.id"] = crow::utility::urlFromPieces(
             "redfish", "v1", "JsonSchemas", schema);
-        members.push_back(std::move(member));
+        members.emplace_back(std::move(member));
     }
     json["Members"] = std::move(members);
     json["Members@odata.count"] = schemas.size();