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_ffdc.cpp b/occ_ffdc.cpp
index 3ec42be..3f10dbe 100644
--- a/occ_ffdc.cpp
+++ b/occ_ffdc.cpp
@@ -77,7 +77,7 @@
         response.read(reply);
         plid = std::get<1>(reply);
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         log<level::ERR>("Failed to create PEL");
     }
@@ -119,7 +119,7 @@
         method.append(path, level, additionalData);
         bus.call(method);
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         log<level::ERR>(
             fmt::format("Failed to create PEL: {}", e.what()).c_str());