rm before trying to git clone

sometimes the git clone got stuck and the container is in crashloopback 

fixes #81

Author: edevosc2c

templates/_bootstrap-georchestra-datadir.tpl

@@ -8,6 +8,7 @@
     mkdir -p /root/.ssh ;
     cp /ssh-secret/ssh-privatekey /root/.ssh/id_rsa ;
     chmod 0600 /root/.ssh/id_rsa ;
+    rm -Rf /etc/georchestra
     {{- end }}
     if [ ! -f /etc/georchestra/default.properties ] ; then
       git clone --depth 1 --single-branch {{ .Values.georchestra.datadir.git.url }} -b {{ .Values.georchestra.datadir.git.ref }} /etc/georchestra ;