Convert event group to a vector of tuples

In preparation for storing each event group member's property state used
within the event's actions, the group type should be converted to a
vector of tuples. This vector will allow, if user defines, easier use of
different interfaces and properties on the same path to be used within
the same event group.

Tested:
    Generated code for groups reflects vector instead of map
    Actions against groups remain unchanged

Change-Id: I9f4bb609de424d9004d43524fd04737a50fb2c6f
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/control/templates/defs.mako b/control/templates/defs.mako
index 6308774..d574c57 100644
--- a/control/templates/defs.mako
+++ b/control/templates/defs.mako
@@ -35,8 +35,8 @@
 %for member in group['members']:
 {
     "${member['object']}",
-    {"${member['interface']}",
-     "${member['property']}"}
+    "${member['interface']}",
+    "${member['property']}"
 },
 %endfor
 %endfor