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: I17807e986cefa6a3d9e757c533ac373035438aed
diff --git a/src/rde/external_storer_file.cpp b/src/rde/external_storer_file.cpp
index 97f2b10..26aa6d7 100644
--- a/src/rde/external_storer_file.cpp
+++ b/src/rde/external_storer_file.cpp
@@ -44,7 +44,7 @@
 }
 
 ExternalStorerFileInterface::ExternalStorerFileInterface(
-    sdbusplus::bus::bus& bus, std::string_view rootPath,
+    sdbusplus::bus_t& bus, std::string_view rootPath,
     std::unique_ptr<FileHandlerInterface> fileHandler) :
     bus(bus),
     rootPath(rootPath), fileHandler(std::move(fileHandler)), logServiceId(""),