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: I223d58649a21565678bd7ef78d955b30d3fd6d84
diff --git a/utils.hpp b/utils.hpp
index edf4f8e..afc5120 100644
--- a/utils.hpp
+++ b/utils.hpp
@@ -62,7 +62,7 @@
      *
      *  @return The Map to constructs all properties values
      *
-     *  @throw sdbusplus::exception::exception when it fails
+     *  @throw sdbusplus::exception_t when it fails
      */
     const PropertyMap getAllProperties(const std::string& objectPath,
                                        const std::string& interface) const;
@@ -75,7 +75,7 @@
      *
      *  @return The value of the property(type: variant)
      *
-     *  @throw sdbusplus::exception::exception when it fails
+     *  @throw sdbusplus::exception_t when it fails
      */
     const PropertyValue getProperty(const std::string& objectPath,
                                     const std::string& interface,
@@ -88,7 +88,7 @@
      *  @param[in] propertyName     -   D-Bus property name
      *  @param[in] value            -   The value to be set
      *
-     *  @throw sdbusplus::exception::exception when it fails
+     *  @throw sdbusplus::exception_t when it fails
      */
     void setProperty(const std::string& objectPath,
                      const std::string& interface,