bugfix xtreemfs-server package, node.save removed

If every recipe needs it, it might as well be in the default recipe.
Plus remove node.save call to make chef-solo happy.
fix mrc/dir replication (needs special repl port)
include support for chef-solo

via chef-solo-search
include 3-node setup in Vagrantfile

to be used with chef-solo-search and the static search results in the
node data_bag