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: Ibd2a0b512bfb7caf65bfab64b271d194da520aac
diff --git a/selutility.cpp b/selutility.cpp
index 344201e..e6b28de 100644
--- a/selutility.cpp
+++ b/selutility.cpp
@@ -181,7 +181,7 @@
 {
     GetSELEntryResponse record{};
 
-    sdbusplus::bus::bus bus{ipmid_get_sd_bus_connection()};
+    sdbusplus::bus_t bus{ipmid_get_sd_bus_connection()};
     auto service = ipmi::getService(bus, logEntryIntf, objPath);
 
     // Read all the log entry properties.
@@ -307,7 +307,7 @@
 
 GetSELEntryResponse convertLogEntrytoSEL(const std::string& objPath)
 {
-    sdbusplus::bus::bus bus{ipmid_get_sd_bus_connection()};
+    sdbusplus::bus_t bus{ipmid_get_sd_bus_connection()};
 
     static constexpr auto assocIntf =
         "xyz.openbmc_project.Association.Definitions";
@@ -368,7 +368,7 @@
 
 std::chrono::seconds getEntryTimeStamp(const std::string& objPath)
 {
-    sdbusplus::bus::bus bus{ipmid_get_sd_bus_connection()};
+    sdbusplus::bus_t bus{ipmid_get_sd_bus_connection()};
 
     auto service = ipmi::getService(bus, logEntryIntf, objPath);
 
@@ -397,7 +397,7 @@
 
 void readLoggingObjectPaths(ObjectPaths& paths)
 {
-    sdbusplus::bus::bus bus{ipmid_get_sd_bus_connection()};
+    sdbusplus::bus_t bus{ipmid_get_sd_bus_connection()};
     auto depth = 0;
     paths.clear();
 
@@ -412,7 +412,7 @@
         auto reply = bus.call(mapperCall);
         reply.read(paths);
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         if (strcmp(e.name(),
                    "xyz.openbmc_project.Common.Error.ResourceNotFound"))