Pull images in installer.sh

This way if the network is not working, then the update will just
fail and use the old version

This also tags the addon images with the semver properly

baseimage/initializeBaseUbuntuImage.sh

@@ -93,6 +93,7 @@ images=$(node -e "var i = require('${arg_infraversionpath}/infra_version.js'); c
 echo -e "\tPulling docker images: ${images}"
 for image in ${images}; do
     docker pull "${image}"
+    docker pull "${image%@sha256:*}" # this will tag the image for readability
 done
 
 echo "==> Install collectd"