deploy: Use cname instead of fqdn

..for astakos, cyclades, pithos, cms, db, mq, nfs.

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>
deploy: Add simplejson as requirement

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>
deploy: Install blktap in Achip component

Currently latest version of archipelago uses blktap instead of
xseg. Install official blktap-dkms and our custom blktap-utils
for this purpose.

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>
backend: Change segment type and name

..to posix and archipelago respectively so that it is working
with the latest archipelago version.

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