Update default floor action

Add action to be able to update the default fan floor thru a configured
event.

Tested:
    Default floor is updated based on state of group property value

Change-Id: I83a4ae313636abbe1e5c8b6ddfc2d5f9d281f844
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/control/zone.hpp b/control/zone.hpp
index e48a981..6982508 100644
--- a/control/zone.hpp
+++ b/control/zone.hpp
@@ -300,6 +300,16 @@
         };
 
         /**
+         * @brief Set the default floor
+         *
+         * @param[in] speed - Speed to set the default floor to
+         */
+        inline void setDefFloor(uint64_t speed)
+        {
+            _defFloorSpeed = speed;
+        };
+
+        /**
          * @brief Get the ceiling speed
          *
          * @return - The current ceiling speed
@@ -637,7 +647,7 @@
         /**
          * The default floor speed for the zone
          */
-        const uint64_t _defFloorSpeed;
+        uint64_t _defFloorSpeed;
 
         /**
          * The default ceiling speed for the zone