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: I9029cc722e7712633c15436bd3868d8c3209f567
diff --git a/presence/json_parser.cpp b/presence/json_parser.cpp
index 7858c4f..02c9a11 100644
--- a/presence/json_parser.cpp
+++ b/presence/json_parser.cpp
@@ -52,7 +52,7 @@
 const auto loggingPath = "/xyz/openbmc_project/logging";
 const auto loggingCreateIface = "xyz.openbmc_project.Logging.Create";
 
-JsonConfig::JsonConfig(sdbusplus::bus::bus& bus) : _bus(bus)
+JsonConfig::JsonConfig(sdbusplus::bus_t& bus) : _bus(bus)
 {}
 
 void JsonConfig::start()