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: I41103c892db258a85640aa1442acd9a295c8a847
diff --git a/systemd_target_signal.cpp b/systemd_target_signal.cpp
index 5f7036f..8c76b97 100644
--- a/systemd_target_signal.cpp
+++ b/systemd_target_signal.cpp
@@ -34,7 +34,7 @@
     {
         this->bus.call_noreply(method);
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         error("Failed to start BMC quiesce target, exception:{ERROR}", "ERROR",
               e);
@@ -62,7 +62,7 @@
     {
         this->bus.call_noreply(method);
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         error("Failed to create systemd target error, error:{ERROR_MSG}, "
               "result:{RESULT}, exception:{ERROR}",
@@ -113,7 +113,7 @@
     return (std::string{});
 }
 
-void SystemdTargetLogging::systemdUnitChange(sdbusplus::message::message& msg)
+void SystemdTargetLogging::systemdUnitChange(sdbusplus::message_t& msg)
 {
     uint32_t id;
     sdbusplus::message::object_path objPath;
@@ -136,8 +136,7 @@
     return;
 }
 
-void SystemdTargetLogging::processNameChangeSignal(
-    sdbusplus::message::message& msg)
+void SystemdTargetLogging::processNameChangeSignal(sdbusplus::message_t& msg)
 {
     std::string name;      // well-known
     std::string old_owner; // unique-name
@@ -164,7 +163,7 @@
     {
         this->bus.call(method);
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         // If error indicates systemd is not on dbus yet then do nothing.
         // The systemdNameChangeSignals callback will detect when it is on