Move getProperty calls to utility

Having all dbus calls run through the same utility reduces the amount of
generated code, and more importantly, gives us a place where we can log
the requests and responses to help with debugging.

Tested: Redfish service validator passes.

Change-Id: Ic1bf45130b5069cd57f7af26e12c8d3159c87c67
Signed-off-by: Ed Tanous <etanous@nvidia.com>
diff --git a/redfish-core/lib/pcie_slots.hpp b/redfish-core/lib/pcie_slots.hpp
index a6796b9..bb9cde0 100644
--- a/redfish-core/lib/pcie_slots.hpp
+++ b/redfish-core/lib/pcie_slots.hpp
@@ -148,8 +148,8 @@
         return;
     }
 
-    sdbusplus::asio::getAllProperties(
-        *crow::connections::systemBus, connectionName, pcieSlotPath,
+    dbus::utility::getAllProperties(
+        connectionName, pcieSlotPath,
         "xyz.openbmc_project.Inventory.Item.PCIeSlot",
         [asyncResp](const boost::system::error_code& ec2,
                     const dbus::utility::DBusPropertiesMap& propertiesList) {