provision and get_nodes working

Change-Id: Ibbd697e37e94af7ac3a73253b96a2a6eb768fdf3

through set facts

Change-Id: I4c06acdfa2f9462a30551068e196480b8230631a

create ansible hosts file for ec2 env

Change-Id: I25fbdb63b15d19e9024adfe01c395763a1499e46