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/pldm.cpp b/pldm.cpp
index a924132..6921861 100644
--- a/pldm.cpp
+++ b/pldm.cpp
@@ -46,7 +46,7 @@
         auto responseMsg = bus.call(method);
         responseMsg.read(pdrs);
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         if (!tracedError)
         {
@@ -129,7 +129,7 @@
     }
 }
 
-void Interface::sensorEvent(sdbusplus::message::message& msg)
+void Interface::sensorEvent(sdbusplus::message_t& msg)
 {
     if (!isOCCSensorCacheValid())
     {
@@ -237,7 +237,7 @@
     }
 }
 
-void Interface::hostStateEvent(sdbusplus::message::message& msg)
+void Interface::hostStateEvent(sdbusplus::message_t& msg)
 {
     std::map<std::string, std::variant<std::string>> properties{};
     std::string interface;
@@ -317,7 +317,7 @@
         auto responseMsg = bus.call(method);
         responseMsg.read(pdrs);
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         log<level::ERR>("pldm: Failed to fetch the state effecter PDRs",
                         entry("ERROR=%s", e.what()));
@@ -528,7 +528,7 @@
                                          mctpInstance.value())
                                  .c_str());
         }
-        catch (const sdbusplus::exception::exception& e)
+        catch (const sdbusplus::exception_t& e)
         {
             log<level::ERR>(
                 fmt::format("pldm: GetInstanceId failed: {}", e.what())