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: I9541d521bf67882215a4a66dce020e38ac2df065
diff --git a/occ_manager.cpp b/occ_manager.cpp
index 22150c2..17cd403 100644
--- a/occ_manager.cpp
+++ b/occ_manager.cpp
@@ -253,7 +253,7 @@
     return occs;
 }
 
-int Manager::cpuCreated(sdbusplus::message::message& msg)
+int Manager::cpuCreated(sdbusplus::message_t& msg)
 {
     namespace fs = std::filesystem;
 
@@ -557,7 +557,7 @@
 
             auto response = bus.call(method);
         }
-        catch (const sdbusplus::exception::exception& e)
+        catch (const sdbusplus::exception_t& e)
         {
             constexpr auto ERROR_DUMP_DISABLED =
                 "xyz.openbmc_project.Dump.Create.Error.Disabled";
@@ -1116,7 +1116,7 @@
             }
         }
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         if (traceAltitudeErr)
         {
@@ -1129,7 +1129,7 @@
 }
 
 // Callback function when ambient temperature changes
-void Manager::ambientCallback(sdbusplus::message::message& msg)
+void Manager::ambientCallback(sdbusplus::message_t& msg)
 {
     double currentTemp = 0;
     uint8_t truncatedTemp = 0xFF;