Set properties when constructing interfaces.

Make use of new sdbusplus support for passing a map
of properties and their values to the interface
constructor.

Change-Id: Ib0dd406fd80c89acb723e3a376af26ba57b53d27
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/test/test.cpp b/test/test.cpp
index 0a941f7..d36aa24 100644
--- a/test/test.cpp
+++ b/test/test.cpp
@@ -207,7 +207,7 @@
         },
         {
             "xyz.openbmc_project.Example.Iface2",
-            {{"ExampleProperty2", "test2"s}}
+            {{"ExampleProperty2", "test2"s}, {"ExampleProperty3", 0ll}}
         },
     };