[Tachyon-191] deploy tachyon cluster on openstack

Deploy Tachyon cluster on OpenStack Compute Node. Tested on RedHat openstack cloud.
@haoyuan @dcapwell @hsaputra @childsb @calvinjia 
Yes, I cannot make vagrant openstack plugin to create a VPC. As a result, the IPs cannot be known in advance and I have to get them from some tricks.