add checks to the installer for juju and docker CE installation

Change-Id: I2fdb488286eb1c80f78a6e9391293f5a35dd0705
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/installers/full_install_osm.sh b/installers/full_install_osm.sh
index d560b4e..b22b9e2 100755
--- a/installers/full_install_osm.sh
+++ b/installers/full_install_osm.sh
@@ -521,10 +521,12 @@
     echo "Adding user to group 'docker'"
     sudo groupadd -f docker
     sudo usermod -aG docker $USER
-    echo "... Docker CE installation done"
     sleep 2
     sudo service docker restart
     echo "... restarted Docker service"
+    sg docker -c "docker version" || FATAL "Docker installation failed"
+    echo "... Docker CE installation done"
+    return 0
 }
 
 function install_docker_compose() {
@@ -540,6 +542,7 @@
     sudo snap install juju --classic
     sudo dpkg-reconfigure -p medium lxd
     sg lxd -c "juju bootstrap localhost osm"
+    [ $(juju status |grep "osm" |wc -l) -eq 1 ] || FATAL "Juju installation failed"
     echo "Finished installation of juju"
 }