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_conf_manager.cpp b/snmp_conf_manager.cpp
index 4ddace1..a606370 100644
--- a/snmp_conf_manager.cpp
+++ b/snmp_conf_manager.cpp
@@ -24,7 +24,7 @@
 using namespace sdbusplus::xyz::openbmc_project::Common::Error;
 using Argument = xyz::openbmc_project::Common::InvalidArgument;
 
-ConfManager::ConfManager(sdbusplus::bus::bus& bus, const char* objPath) :
+ConfManager::ConfManager(sdbusplus::bus_t& bus, const char* objPath) :
     details::CreateIface(bus, objPath,
                          details::CreateIface::action::defer_emit),
     dbusPersistentLocation(SNMP_CONF_PERSIST_PATH), bus(bus),