deploy: Allow passwordless ssh in vcluster nodes

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>
deploy/ci: Change conf files for easy setup

Update conf files to support three basic setups:

 synnefo: Used by ci in order to install the whole stack in one node
with --autoconf

 qa: Three node setup with one development node and two ganeti nodes

 vc: Four node setup to test synnefo deployment on multinode virtual
cluster

So, we now have:

 snf-deploy synnefo --setup synnefo --autoconf

 snf-deploy ganeti-qa --setup qa

 snf-deploy vcluster --setup vc

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>