Export objects prior to bus name grab

The default behavior in pyphosphor changed such that ObjectManager
and Properties signals are not emitted by default.  Enable signals
just prior to bus name grab.

Change-Id: I27a2de4b60482dd843702396f33c7cdccaf17277
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/pyipmitest/ipmi_debug.py b/pyipmitest/ipmi_debug.py
index 3e0ea18..b898318 100644
--- a/pyipmitest/ipmi_debug.py
+++ b/pyipmitest/ipmi_debug.py
@@ -89,6 +89,8 @@
     obj = IpmiDebug(bus, OBJ_NAME)
     mainloop = gobject.MainLoop()
     r = ConsoleReader(obj)
+
+    obj.unmask_signals()
     name = dbus.service.BusName(DBUS_NAME, bus)
 
     print ("Enter IPMI packet as hex values. First three bytes will be used"