Updated Dockerfiles to use ReleaseEIGHT-daily repo by default

Change-Id: I0dd48e273a3a12553062418f1da0d60f33bb23b2
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/docker/MON/Dockerfile b/docker/MON/Dockerfile
index 22451fc..702ff08 100644
--- a/docker/MON/Dockerfile
+++ b/docker/MON/Dockerfile
@@ -45,7 +45,7 @@
       'paramiko'   # PyNaCl
 
 ARG REPOSITORY_BASE=http://osm-download.etsi.org/repository/osm/debian
-ARG RELEASE=ReleaseFOUR-daily
+ARG RELEASE=ReleaseEIGHT-daily
 ARG REPOSITORY_KEY=OSM%20ETSI%20Release%20Key.gpg
 ARG REPOSITORY=testing