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/system_configuration.cpp b/src/system_configuration.cpp
index b430bfc..e1bbf2e 100644
--- a/src/system_configuration.cpp
+++ b/src/system_configuration.cpp
@@ -25,7 +25,7 @@
 using SystemConfigIntf =
     sdbusplus::xyz::openbmc_project::Network::server::SystemConfiguration;
 
-SystemConfiguration::SystemConfiguration(sdbusplus::bus::bus& bus,
+SystemConfiguration::SystemConfiguration(sdbusplus::bus_t& bus,
                                          const std::string& objPath) :
     Iface(bus, objPath.c_str(), Iface::action::defer_emit),
     bus(bus)
@@ -72,7 +72,7 @@
         reply.read(name);
         return std::get<std::string>(name);
     }
-    catch (const sdbusplus::exception::exception& ex)
+    catch (const sdbusplus::exception_t& ex)
     {
         log<level::ERR>(
             "Failed to get the hostname from systemd-hostnamed service",