Bump xos libraries to version 4.0.0

Change-Id: If2cd9948426956a237e5ab65c3cfb724966bf521
diff --git a/requirements.txt b/requirements.txt
index f0dff7f..76e65cb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-xossynchronizer~=3.2.1
-xosapi~=3.2.1
-xoskafka~=3.2.1
+xossynchronizer~=4.0.0
+xosapi~=4.0.0
+xoskafka~=4.0.0
 ipaddress~=1.0.22