[SEBA-154] Have tosca loader Dockerfile use master so KafkaLogHandler is included

Change-Id: Ic40cc4d31fb16e05b1d10a7c1d4053e70aad8ca7
diff --git a/Dockerfile b/Dockerfile
index 5fec234..dd21566 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 # docker build -t xosproject/xos-tosca:candidate .
 
 # xosproject/xos-tosca
-FROM xosproject/xos-client:2.0.0
+FROM xosproject/xos-client:master
 
 # Set environment variables
 ENV CODE_SOURCE .