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/epoch_base.cpp b/epoch_base.cpp
index a336573..17be2c6 100644
--- a/epoch_base.cpp
+++ b/epoch_base.cpp
@@ -24,8 +24,8 @@
 using namespace phosphor::logging;
 using FailedError = sdbusplus::xyz::openbmc_project::Time::Error::Failed;
 
-EpochBase::EpochBase(sdbusplus::bus::bus& bus, const char* objPath) :
-    sdbusplus::server::object::object<EpochTime>(bus, objPath), bus(bus)
+EpochBase::EpochBase(sdbusplus::bus_t& bus, const char* objPath) :
+    sdbusplus::server::object_t<EpochTime>(bus, objPath), bus(bus)
 {}
 
 void EpochBase::onModeChanged(Mode mode)
@@ -46,7 +46,7 @@
     {
         bus.call_noreply(method);
     }
-    catch (const sdbusplus::exception::exception& ex)
+    catch (const sdbusplus::exception_t& ex)
     {
         lg2::error("Error in setting system time: {ERROR}", "ERROR", ex);
         using namespace xyz::openbmc_project::Time;