vol-374 correctly build docker images

Change-Id: I4eaa623816744a8a677412ad17ce0ab5860a1350
diff --git a/docker/Dockerfile.onos b/docker/Dockerfile.onos
index b81c80a..18b2842 100644
--- a/docker/Dockerfile.onos
+++ b/docker/Dockerfile.onos
@@ -38,7 +38,8 @@
 
 # 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