Actually respect keypair_path from knife.rb.
Actually respect keypair_path from knife.rb.

infochimps-away/cluster_chef,infochimps-away/cluster_chef,infochimps-labs/ironfan,infochimps-away/cluster_chef,infochimps-away/cluster_chef,infochimps-labs/ironfan,infochimps-labs/ironfan