[TACHYON-127] Deploy Tachyon Cluster through Vagrant 

What's working?
We can start a Tachyon cluster on VirtualBox and AWS using HDFS 2.4.1 and glusterfs as under filesystem.

What next?
- more under filesystem (ceph, hadoop 1.0.4)
- more providers: Docker, OpenStack.

@haoyuan 
When I try to start up the instances without a subnet, I get the following error.

InvalidParameterCombination => Specifying an IP address is only valid for VPC instances and thus requires a subnet in which to launch

I think this makes sense because there is no guarantee the specified ips will be available even if they are in the region's ip block?