control: Change `addGroup()` to get all managed objects

The addGroup method is used to populate the cache with event groups
triggered by a timer when the "preload_groups" directive is used.
Instead of going out to dbus to refresh the cache for each group member,
use the ObjectManager interface to retrieve all the managed objects for
each unique service of the group members.

Change-Id: I61136409f035cd78a1762b4e22b00376e1cb4a43
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
1 file changed