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: I223d58649a21565678bd7ef78d955b30d3fd6d84
diff --git a/manager/lamptest/lamptest.cpp b/manager/lamptest/lamptest.cpp
index 99d0318..57e5a33 100644
--- a/manager/lamptest/lamptest.cpp
+++ b/manager/lamptest/lamptest.cpp
@@ -142,7 +142,7 @@
             period = std::get<uint16_t>(properties["Period"]);
             dutyOn = std::get<uint8_t>(properties["DutyOn"]);
         }
-        catch (const sdbusplus::exception::exception& e)
+        catch (const sdbusplus::exception_t& e)
         {
             lg2::error(
                 "Failed to get All properties, ERROR = {ERROR}, PATH = {PATH}",
@@ -254,7 +254,7 @@
                                 "xyz.openbmc_project.Led.Group", "Asserted",
                                 assertedValue);
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         lg2::error(
             "Failed to set Asserted property, ERROR = {ERROR}, PATH = {PATH}",