[scripts] Don't update _ci environment on buildout reruns

scripts/docker_pull.sh

@@ -8,8 +8,6 @@ if [ ! -e ${basedir}/_ci/functions.sh ]; then
   curl --silent "https://gitlab.idiap.ch/bob/bob.admin/raw/master/gitlab/install.sh" > ${basedir}/_ci/install.sh
   chmod 755 ${basedir}/_ci/install.sh
   ${basedir}/_ci/install.sh ${basedir}/_ci master #installs ci support scripts
-else
-  ${basedir}/_ci/install.sh ${basedir}/_ci master #updates ci support scripts
 fi
 
 if [ "${BUILDOUT}" == "true" ]; then