make authorized_keys file mode less permissive.
Merge pull request #264 from kamidzi/master

make authorized_keys file mode less permissive.
fix errant newline
setup zookeeper on headnodes
setup cassandra on headnodes
setup redis on headnodes
get contrail up and running
replace nova-network with neutron
clean-up vars and other remainders from nova-network
no longer need ip forwarding enabled
partially remove floating vip