Revert "Merge pull request #234 from crawford/validate"

This reverts commit cdfc94f4e9, reversing
changes made to 2051cd3e1c.

Conflicts:
	initialize/config.go
	system/etcd.go
	system/etcd_test.go
	system/fleet.go
	system/fleet_test.go
	system/update.go
	system/update_test.go
	test

initialize/etcd.go

@@ -0,0 +1,63 @@
+package initialize
+
+import (
+	"errors"
+	"fmt"
+	"sort"
+
+	"github.com/coreos/coreos-cloudinit/system"
+)
+
+type EtcdEnvironment map[string]string
+
+func (ee EtcdEnvironment) String() (out string) {
+	norm := normalizeSvcEnv(ee)
+
+	if val, ok := norm["DISCOVERY_URL"]; ok {
+		delete(norm, "DISCOVERY_URL")
+		if _, ok := norm["DISCOVERY"]; !ok {
+			norm["DISCOVERY"] = val
+		}
+	}
+
+	var sorted sort.StringSlice
+	for k, _ := range norm {
+		sorted = append(sorted, k)
+	}
+	sorted.Sort()
+
+	out += "[Service]\n"
+
+	for _, key := range sorted {
+		val := norm[key]
+		out += fmt.Sprintf("Environment=\"ETCD_%s=%s\"\n", key, val)
+	}
+
+	return
+}
+
+// Units creates a Unit file drop-in for etcd, using any configured
+// options and adding a default MachineID if unset.
+func (ee EtcdEnvironment) Units(root string) ([]system.Unit, error) {
+	if len(ee) < 1 {
+		return nil, nil
+	}
+
+	if _, ok := ee["name"]; !ok {
+		if machineID := system.MachineID(root); machineID != "" {
+			ee["name"] = machineID
+		} else if hostname, err := system.Hostname(); err == nil {
+			ee["name"] = hostname
+		} else {
+			return nil, errors.New("Unable to determine default etcd name")
+		}
+	}
+
+	etcd := system.Unit{
+		Name:    "etcd.service",
+		Runtime: true,
+		DropIn:  true,
+		Content: ee.String(),
+	}
+	return []system.Unit{etcd}, nil
+}