control: Have iA match use arg0Path param

InterfacesAdded signals are sent from the path the ObjectManager is
implemented on, and the path that has the new interface is in the first
argument of the signal.

For example, this dbus-monitor output:
    path=/org/open_power/control;
    interface=org.freedesktop.DBus.ObjectManager;
    member=InterfacesAdded
    object path "/org/open_power/control/occ1"

Update the match string for this signal to match on the group member
using 'arg0path' (the .../occ1 entry above) instead of 'path' (the
/org/open_power/control entry).

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: If22157aa863504415f771aa366bc45b0e91405d7
1 file changed