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: Ib15ce49ac136da396084ab09972dd132f02beeea
diff --git a/snmp_client.cpp b/snmp_client.cpp
index c084ea4..4dc3d57 100644
--- a/snmp_client.cpp
+++ b/snmp_client.cpp
@@ -10,8 +10,8 @@
 namespace snmp
 {
 
-Client::Client(sdbusplus::bus::bus& bus, const char* objPath,
-               ConfManager& parent, const std::string& address, uint16_t port) :
+Client::Client(sdbusplus::bus_t& bus, const char* objPath, ConfManager& parent,
+               const std::string& address, uint16_t port) :
     Ifaces(bus, objPath, Ifaces::action::defer_emit),
     id(std::stol(std::filesystem::path(objPath).filename())), parent(parent)
 {