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: Ief05bd757cffb1453e058a719ee4b060861752e7
diff --git a/phosphor-power-sequencer/src/power_interface.cpp b/phosphor-power-sequencer/src/power_interface.cpp
index 06e17da..d3def79 100644
--- a/phosphor-power-sequencer/src/power_interface.cpp
+++ b/phosphor-power-sequencer/src/power_interface.cpp
@@ -33,7 +33,7 @@
 namespace phosphor::power::sequencer
 {
 
-PowerInterface::PowerInterface(sdbusplus::bus::bus& bus, const char* path) :
+PowerInterface::PowerInterface(sdbusplus::bus_t& bus, const char* path) :
     serverInterface(bus, path, POWER_IFACE, vtable, this)
 {}
 
@@ -52,7 +52,7 @@
             log<level::INFO>(
                 fmt::format("callbackGetPgood: {}", pgood).c_str());
 
-            sdbusplus::message::message(msg).append(pgood);
+            sdbusplus::message_t(msg).append(pgood);
         }
         catch (const sdbusplus::exception_t& e)
         {
@@ -85,7 +85,7 @@
             log<level::INFO>(
                 fmt::format("callbackGetPgoodTimeout: {}", timeout).c_str());
 
-            sdbusplus::message::message(msg).append(timeout);
+            sdbusplus::message_t(msg).append(timeout);
         }
         catch (const sdbusplus::exception_t& e)
         {
@@ -117,7 +117,7 @@
             log<level::INFO>(
                 fmt::format("callbackGetPowerState: {}", pgood).c_str());
 
-            auto reply = sdbusplus::message::message(msg).new_method_return();
+            auto reply = sdbusplus::message_t(msg).new_method_return();
             reply.append(pgood);
             reply.method_return();
         }
@@ -147,7 +147,7 @@
     {
         try
         {
-            auto m = sdbusplus::message::message(msg);
+            auto m = sdbusplus::message_t(msg);
 
             int timeout{};
             m.read(timeout);
@@ -188,7 +188,7 @@
             log<level::INFO>(
                 fmt::format("callbackGetState: {}", state).c_str());
 
-            sdbusplus::message::message(msg).append(state);
+            sdbusplus::message_t(msg).append(state);
         }
         catch (const sdbusplus::exception_t& e)
         {
@@ -212,7 +212,7 @@
     {
         try
         {
-            auto m = sdbusplus::message::message(msg);
+            auto m = sdbusplus::message_t(msg);
 
             int state{};
             m.read(state);
@@ -254,7 +254,7 @@
     {
         try
         {
-            auto m = sdbusplus::message::message(msg);
+            auto m = sdbusplus::message_t(msg);
 
             std::string psError{};
             m.read(psError);