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: Ib15ce49ac136da396084ab09972dd132f02beeea
diff --git a/snmp_util.cpp b/snmp_util.cpp
index 9516337..818bdc1 100644
--- a/snmp_util.cpp
+++ b/snmp_util.cpp
@@ -16,7 +16,7 @@
 using namespace phosphor::logging;
 using namespace sdbusplus::xyz::openbmc_project::Common::Error;
 
-ObjectValueTree getManagedObjects(sdbusplus::bus::bus& bus,
+ObjectValueTree getManagedObjects(sdbusplus::bus_t& bus,
                                   const std::string& service,
                                   const std::string& objPath)
 {
@@ -31,7 +31,7 @@
         auto reply = bus.call(method);
         reply.read(interfaces);
     }
-    catch (const sdbusplus::exception::exception& e)
+    catch (const sdbusplus::exception_t& e)
     {
         lg2::error("Failed to get managed objects: {PATH}", "PATH", objPath);
         elog<InternalFailure>();