update to etcd 0.3 client API

api.go

etcd_client.go

masterelection/masterelection.go

node/node.go

third_party/github.com/coreos/go-etcd/etcd/add_child.go

third_party/github.com/coreos/go-etcd/etcd/add_child_test.go

third_party/github.com/coreos/go-etcd/etcd/client.go

third_party/github.com/coreos/go-etcd/etcd/client_test.go

third_party/github.com/coreos/go-etcd/etcd/cluster.go

...arty/github.com/coreos/go-etcd/etcd/compare_and_delete.go

...github.com/coreos/go-etcd/etcd/compare_and_delete_test.go

..._party/github.com/coreos/go-etcd/etcd/compare_and_swap.go

...y/github.com/coreos/go-etcd/etcd/compare_and_swap_test.go

third_party/github.com/coreos/go-etcd/etcd/debug.go

third_party/github.com/coreos/go-etcd/etcd/delete.go

third_party/github.com/coreos/go-etcd/etcd/delete_test.go

third_party/github.com/coreos/go-etcd/etcd/error.go

third_party/github.com/coreos/go-etcd/etcd/get.go

third_party/github.com/coreos/go-etcd/etcd/get_test.go

third_party/github.com/coreos/go-etcd/etcd/options.go