Remove property change trace

Fan control is required to be configured for all possible temperature
sensors within a machine type, however not every configuration of
that machine type contains all of those sensors. The trace removed here
was filling the journal with unnecessary entries for sensors that are
expected to not be present.

Tested:
    Journal entry is not longer traced

Change-Id: Iccb85ae7e9463ee03522ce4efde6410ed14a76ca
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/control/functor.hpp b/control/functor.hpp
index 2ca047c..17ae3af 100644
--- a/control/functor.hpp
+++ b/control/functor.hpp
@@ -117,11 +117,6 @@
             {
                 // Property will not be used unless a property changed
                 // signal message is received for this property.
-                log<level::INFO>(
-                    "Property not used, unless PropertyChanged signal received",
-                    entry("PATH=%s", _path),
-                    entry("INTERFACE=%s", _iface),
-                    entry("PROPERTY=%s", _property));
             }
         }
     }