Add os per node
This is needed for heterogeneous setups.Depending on os the corresponding sources file is addedand the proper synnefo packages are installed (~wheezy or ~squeeze)
Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>
snf-deploy: Use filebased email_backend
Change the email backend from dummy to a filebased one.
Add snf-deploy tree