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: I9cedddf4dc9b224ecbc2f68e6b00c0ab1885a826
diff --git a/manager.cpp b/manager.cpp
index ceaed7e..660102f 100644
--- a/manager.cpp
+++ b/manager.cpp
@@ -27,7 +27,7 @@
 
 using namespace phosphor::logging;
 
-Manager::Manager(sdbusplus::bus::bus& bus) : bus(bus), settings(bus)
+Manager::Manager(sdbusplus::bus_t& bus) : bus(bus), settings(bus)
 {
     using namespace sdbusplus::bus::match::rules;
     settingsMatches.emplace_back(
@@ -52,7 +52,7 @@
     onTimeModeChanged(value);
 }
 
-int Manager::onSettingsChanged(sdbusplus::message::message& msg)
+int Manager::onSettingsChanged(sdbusplus::message_t& msg)
 {
     using Interface = std::string;
     using Property = std::string;
@@ -86,7 +86,7 @@
         bus.call_noreply(method);
         lg2::info("Updated NTP setting: {ENABLED}", "ENABLED", isNtp);
     }
-    catch (const sdbusplus::exception::exception& ex)
+    catch (const sdbusplus::exception_t& ex)
     {
         lg2::error("Failed to update NTP setting: {ERROR}", "ERROR", ex);
     }