Add interfacesAdded subscriptions to groups

For each group in an event, subscribe to the interfacesAdded signals in
the case where the member(s) of a group may or may not exist when
initialized.

Additionally, updated to use the propertiesChanged function to remove
repetitive property change subscription lines generated.

Change-Id: I52b0cd839383ebb90e93a81b5bac02ee7c4f44b2
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
1 file changed