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: Ief1b330c4f623ecc1be771f36083780a12260834
diff --git a/src/ipaddress.cpp b/src/ipaddress.cpp
index 0af0756..ee87d6c 100644
--- a/src/ipaddress.cpp
+++ b/src/ipaddress.cpp
@@ -18,7 +18,7 @@
 using NotAllowed = sdbusplus::xyz::openbmc_project::Common::Error::NotAllowed;
 using Reason = xyz::openbmc_project::Common::NotAllowed::REASON;
 
-IPAddress::IPAddress(sdbusplus::bus::bus& bus, const char* objPath,
+IPAddress::IPAddress(sdbusplus::bus_t& bus, const char* objPath,
                      EthernetInterface& parent, IP::Protocol type,
                      const std::string& ipaddress, IP::AddressOrigin origin,
                      uint8_t prefixLength, const std::string& gateway) :