vol-374 correctly build docker images

Change-Id: I275ca749aa7173db83d3fb744234d21d18a4d234
diff --git a/docker/Dockerfile.onos b/docker/Dockerfile.onos
index acaa845..60d40e3 100644
--- a/docker/Dockerfile.onos
+++ b/docker/Dockerfile.onos
@@ -49,7 +49,8 @@
 
 # Install the applications
 COPY config/app-install.sh .
-RUN chmod 755 ./app-install.sh && ./app-install.sh
+RUN chmod 755 ./app-install.sh
+RUN ./app-install.sh
 
 # Create the final image coping over the installed applications from the build stage
 FROM onosproject/onos:1.8