sdbusplus: use shorter type aliases

The sdbusplus headers provide shortened aliases for many types.
Switch to using them to provide better code clarity and shorter
lines.  Possible replacements are for:
  * bus_t
  * exception_t
  * manager_t
  * match_t
  * message_t
  * object_t
  * slot_t

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ief1b330c4f623ecc1be771f36083780a12260834
diff --git a/src/vlan_interface.hpp b/src/vlan_interface.hpp
index c003056..953a01b 100644
--- a/src/vlan_interface.hpp
+++ b/src/vlan_interface.hpp
@@ -46,7 +46,7 @@
      *
      *  This constructor is called during loading the VLAN Interface
      */
-    VlanInterface(sdbusplus::bus::bus& bus, const std::string& objPath,
+    VlanInterface(sdbusplus::bus_t& bus, const std::string& objPath,
                   DHCPConf dhcpEnabled, bool nicEnabled, uint32_t vlanID,
                   EthernetInterface& intf, Manager& parent);