[SEBA-450] (part 2)

Add tox testing support on additional XOS library modules:

- xos-api
- xos-kafka (has no tests)
- xos-migrate (has no tests)
- xos-synchronizer

Change-Id: I98195bc9747971d3515882d517affe058dd86ac5
diff --git a/lib/xos-api/xosapi/chameleon_client/asleep.py b/lib/xos-api/xosapi/chameleon_client/asleep.py
index 295f675..cdba793 100644
--- a/lib/xos-api/xosapi/chameleon_client/asleep.py
+++ b/lib/xos-api/xosapi/chameleon_client/asleep.py
@@ -13,6 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+from __future__ import absolute_import
 from twisted.internet import reactor
 from twisted.internet.defer import Deferred
 
@@ -25,4 +26,4 @@
     """
     d = Deferred()
     reactor.callLater(dt, lambda: d.callback(None))
-    return d
\ No newline at end of file
+    return d