core: fixed findByFeatures:

jids where not correctly put in `found_own` and `found_roster` lists.

sat/plugins/plugin_adhoc_dbus.py

@@ -329,9 +329,9 @@ class AdHocDBus(object):
             - device name
             - device label
         """
-        found_data = yield self.host.findByFeatures(
+        found_data = yield defer.ensureDeferred(self.host.findByFeatures(
             client, [self.host.ns_map['commands']], service=False, roster=False,
-            own_jid=True, local_device=True)
+            own_jid=True, local_device=True))
 
         remotes = []