Add random prefix to components

[clstokes]

Some cloud providers require unique names for certain components and this can cause collisions and failed deployments if users enter commonly used names for their cluster names. The deployment should add a random prefix to components on deployment. This value should be consistent across all components and providers for the same global cluster.

e.g.

$ triton ls
SHORTID   NAME               IMG                              STATE    FLAGS  AGE
224569d6  fda-312-clstokes-master-1  ubuntu-certified-16.04@20180109  running  K      17h
afb6ee91  fda-312-etcd-1             ubuntu-certified-16.04@20180109  running  K      17h
56e1d04a  fda-312-node-2             ubuntu-certified-16.04@20180109  running  K      17h
55d0624b  fda-312-node-1             ubuntu-certified-16.04@20180109  running  K      17h
96d4a1de  fda-312-node-4             ubuntu-certified-16.04@20180109  running  K      16h
f815fb11  fda-312-node-3             ubuntu-certified-16.04@20180109  running  K      16h