Add path to trace for missing property

When a property can not be found after receiving a property changed
signal include the path for the property on the journal entry.

Change-Id: Ie0151b943914e02d38bf89760f8a16dc530aa89e
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/control/functor.hpp b/control/functor.hpp
index de04226..06e8db9 100644
--- a/control/functor.hpp
+++ b/control/functor.hpp
@@ -96,7 +96,8 @@
             {
                 log<level::ERR>("Unable to find property on interface",
                                 entry("PROPERTY=%s", _property),
-                                entry("INTERFACE=%s", _iface));
+                                entry("INTERFACE=%s", _iface),
+                                entry("PATH=%s", _path));
                 return;
             }