Add interface to uniquely identify properties

The interface is needed on the properties stored to uniquely identify
each property used in events.

Change-Id: Ia062f25514d7ed04ef1023a02eecad4738711ffb
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/control/zone.cpp b/control/zone.cpp
index 849cd91..7a61c77 100644
--- a/control/zone.cpp
+++ b/control/zone.cpp
@@ -58,6 +58,7 @@
                                 std::get<propPos>(entry.second),
                                 value);
                     setPropertyValue(entry.first.c_str(),
+                                     std::get<intfPos>(entry.second).c_str(),
                                      std::get<propPos>(entry.second).c_str(),
                                      value);
                 }