Updated Dockerfiles to use ReleaseEIGHT-daily repo by default

Change-Id: I0dd48e273a3a12553062418f1da0d60f33bb23b2
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/docker/mk/Makefile.include b/docker/mk/Makefile.include
index b4e63f9..e151748 100644
--- a/docker/mk/Makefile.include
+++ b/docker/mk/Makefile.include
@@ -22,7 +22,7 @@
 TAG ?= 6
 
 REPOSITORY_BASE ?= http://osm-download.etsi.org/repository/osm/debian
-RELEASE         ?= ReleaseFOUR-daily
+RELEASE         ?= ReleaseEIGHT-daily
 REPOSITORY_KEY  ?= OSM%20ETSI%20Release%20Key.gpg
 REPOSITORY      ?= testing
 NO_CACHE        ?= --no-cache