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>
8 files changed