Update RELEASE variable to ReleaseTHREE by default

Change-Id: I4b2d58bbd1399fbdff713f8529aab1c746edd405
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/installers/install_osm.sh b/installers/install_osm.sh
index f1268fe..1bb4257 100755
--- a/installers/install_osm.sh
+++ b/installers/install_osm.sh
@@ -300,6 +300,7 @@
 COMMIT_ID=""
 ASSUME_YES=""
 INSTALL_FROM_SOURCE=""
+RELEASE="-R ReleaseTHREE"
 
 while getopts ":hy-:b:r:k:u:R:" o; do
     case "${o}" in