Replace kafka library by kafka-python library

Change-Id: Ia1da842373d8b3e79b0e6fc39e127b17a9033b89
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/requirements.in b/requirements.in
index 928eef8..16dc462 100644
--- a/requirements.in
+++ b/requirements.in
@@ -25,8 +25,8 @@
 cryptography
 gnocchiclient
 humanfriendly
+kafka-python
 lxml
-kafka
 prometheus-api-client
 prometheus-client
 python-ceilometerclient