control: Switch to using static instance of bus

Update main to use the static reference of the bus from
util::SDBusPlus.getBus() and have each object that needs the bus call
that same util::SDBusPlus.getBus() function to retrieve the same static
reference.

Change-Id: Icd5a0e61819bf1bec8b46daae05443fdcc542b05
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/control/json/group.hpp b/control/json/group.hpp
index ce8d12c..dd5c6a0 100644
--- a/control/json/group.hpp
+++ b/control/json/group.hpp
@@ -55,9 +55,8 @@
      * Parses and populates a configuration group from JSON object data
      *
      * @param[in] jsonObj - JSON object
-     * @param[in] sdbusplus bus object not used
      */
-    Group(const json& jsonObj, sdbusplus::bus::bus&);
+    Group(const json& jsonObj);
 
     /**
      * Copy Constructor