control: Add creating config object without a dbus object

For those configuration objects that do not need a dbus object, create
them using a similar method without requiring a dbus object to be given.
Updated each object to correctly reflect their current need of a dbus
object which was driven by moving the creation of the available group
objects to within the event.

Change-Id: I8ce4ea7baf4cfd1ad86268b760a334fcf0a4f25e
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/control/json/group.hpp b/control/json/group.hpp
index 7cc84e9..e8d607f 100644
--- a/control/json/group.hpp
+++ b/control/json/group.hpp
@@ -18,7 +18,6 @@
 #include "config_base.hpp"
 
 #include <nlohmann/json.hpp>
-#include <sdbusplus/bus.hpp>
 
 namespace phosphor::fan::control::json
 {
@@ -56,10 +55,9 @@
      * Constructor
      * Parses and populates a configuration group from JSON object data
      *
-     * @param[in] bus - sdbusplus bus object
      * @param[in] jsonObj - JSON object
      */
-    Group(sdbusplus::bus::bus& bus, const json& jsonObj);
+    Group(const json& jsonObj);
 
     /**
      * @brief Get the members