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/utils.hpp b/utils.hpp
index 9639cbf..6f2fc62 100644
--- a/utils.hpp
+++ b/utils.hpp
@@ -23,7 +23,7 @@
  * @return The value of the property
  */
 template <typename T>
-T getProperty(sdbusplus::bus::bus& bus, const char* service, const char* path,
+T getProperty(sdbusplus::bus_t& bus, const char* service, const char* path,
               const char* interface, const char* propertyName)
 {
     auto method = bus.new_method_call(service, path,
@@ -36,7 +36,7 @@
         reply.read(value);
         return std::get<T>(value);
     }
-    catch (const sdbusplus::exception::exception& ex)
+    catch (const sdbusplus::exception_t& ex)
     {
         lg2::error("GetProperty call failed, path:{PATH}, interface:{INTF}, "
                    "propertyName:{NAME}, error:{ERROR}",
@@ -54,7 +54,7 @@
  *
  * @return The name of the service
  */
-std::string getService(sdbusplus::bus::bus& bus, const char* path,
+std::string getService(sdbusplus::bus_t& bus, const char* path,
                        const char* interface);
 
 /** @brief Convert a string to enum Mode