Refactor D-Bus object

- The intent behind this commit is to refactor D-Bus, and abstract
  the bus, getService, getProperty and other methods into the utils
  file, and other file operations D-Bus only need to include
  uitls.hpp.

- We can also continue to add other general methods such as
  setPropery, getSubTree in the utils file in the future.

- Also, removed redundant files(occ_finder.hpp and occ_finder.cpp).

Tested: built openpower-occ-control successfully and worked.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I53e61e30a76173c154a9f47fc122936468abbc4b
diff --git a/occ_pass_through.hpp b/occ_pass_through.hpp
index 0c01ae4..ef31826 100644
--- a/occ_pass_through.hpp
+++ b/occ_pass_through.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "occ_command.hpp"
+#include "utils.hpp"
 
 #include <fmt/core.h>
 
@@ -35,10 +36,9 @@
     PassThrough& operator=(PassThrough&&) = default;
 
     /** @brief Ctor to put pass-through d-bus object on the bus
-     *  @param[in] bus - Bus to attach to
      *  @param[in] path - Path to attach at
      */
-    PassThrough(sdbusplus::bus::bus& bus, const char* path);
+    PassThrough(const char* path);
 
     /** @brief Pass through command to OCC from dbus
      *  @param[in] command - command to pass-through